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/home/teltatz/public_html/wp-admin/admin-wolf.php
/home/teltatz/public_html/wp-content/edit-wolf.php
/home/teltatz/public_html/wp-includes/widgets/class-wp-wolf-widget.php

SavvyWolf - MANAGER

Edit File: lp-admin-functions.php

<?php
/**
 * Common functions used for admin
 *
 * @package   LearnPress
 * @author    ThimPress
 * @version   1.0
 */

/**
 * Prevent loading this file directly
 */
defined( 'ABSPATH' ) || exit();

if ( ! function_exists( 'learn_press_add_row_action_link' ) ) {
	/**
	 * Setup action links to the admin course, lesson, quiz, question. e.g: Add Duplicate link, hide View link for lesson, quiz so on.
	 *
	 * @param $actions
	 *
	 * @return mixed
	 */
	function learn_press_add_row_action_link( $actions ) {

global $post;

if ( LP_COURSE_CPT == $post->post_type ) {
			$duplicate_link = '#';
			$duplicate_link = array(
				array(
					'link'  => $duplicate_link,
					'title' => _x( 'Duplicate', 'copy course', 'learnpress' ),
					'class' => 'lp-duplicate-post lp-duplicate-course',
					'data'  => $post->ID,
				),
			);

$links = apply_filters( 'learn_press_row_action_links', $duplicate_link );

if ( count( $links ) > 1 ) {
				$drop_down = array( '<ul class="lpr-row-action-dropdown">' );

foreach ( $links as $link ) {
					$drop_down[] = '<li>' . sprintf(
						'<a href="%s" class="%s" data-post-id="%s">%s</a>',
						$link['link'],
						$link['class'],
						$link['data'],
						$link['title']
					) . '</li>';
				};

$drop_down[] = '</ul>';
				$link        = sprintf(
					'<div class="lpr-row-actions"><a href="%s">%s</a>%s</div>',
					'javascript: void(0);',
					__( 'Course', 'learnpress' ),
					join( "\n", $drop_down )
				);

} else {
				$link = array_shift( $links );
				$link = sprintf(
					'<a href="%s" class="%s" data-post-id="%s">%s</a>',
					$link['link'],
					$link['class'],
					$link['data'],
					$link['title']
				);
			}

$actions['lp-duplicate-row-action'] = $link;

} elseif ( LP_QUIZ_CPT === $post->post_type ) {
			unset( $actions['view'] );
			$link                               = sprintf(
				'<a href="#" class="lp-duplicate-post lp-duplicate-quiz" data-post-id="%s">%s</a>',
				$post->ID,
				_x( 'Duplicate', 'copy quiz', 'learnpress' )
			);
			$actions['lp-duplicate-row-action'] = $link;

} elseif ( LP_QUESTION_CPT === $post->post_type ) {
			unset( $actions['view'] );
			$link                               = sprintf(
				'<a href="#" class="lp-duplicate-post lp-duplicate-question" data-post-id="%s">%s</a>',
				$post->ID,
				_x( 'Duplicate', 'copy question', 'learnpress' )
			);
			$actions['lp-duplicate-row-action'] = $link;

} elseif ( LP_LESSON_CPT === $post->post_type ) {
			unset( $actions['view'] );
			$link                               = sprintf(
				'<a href="#" class="lp-duplicate-post lp-duplicate-lesson" data-post-id="%s">%s</a>',
				$post->ID,
				_x( 'Duplicate', 'copy lesson', 'learnpress' )
			);
			$actions['lp-duplicate-row-action'] = $link;
		}

return apply_filters( 'learn-press/row-action-links', $actions );
	}

add_filter( 'post_row_actions', 'learn_press_add_row_action_link' );
	add_filter( 'page_row_actions', 'learn_press_add_row_action_link' );
}

function learn_press_is_hidden_post_box( $id, $user_id = 0 ) {
	if ( ! $user_id ) {
		$user_id = get_current_user_id();
	}

$data = learn_press_get_user_option( 'post-closed-box' );
	if ( ! $data ) {
		$data = array();
	}

return false !== array_search( $id, $data );
}

/**
 * List all pages as a dropdown with "Add New Page" option
 *
 * @param            $name
 * @param bool|false $selected
 * @param array      $args
 *
 * @return mixed|string
 */
function learn_press_pages_dropdown( $name, $selected = false, $args = array() ) {
	$id           = null;
	$class        = null;
	$css          = null;
	$before       = array(
		'add_new_page' => __( '[ Add a new page ]', 'learnpress' ),
	);
	$after        = null;
	$echo         = true;
	$allow_create = true;

if ( func_num_args() == 1 && is_array( $name ) ) {
		$args = $name;
	}

is_array( $args ) && extract( $args );

if ( empty( $id ) ) {
		$id = $name;
	}

$class .= 'list-pages lp-list-pages learn-press-select2';

$args    = array(
		'name'             => $name,
		'id'               => $id,
		'sort_column'      => 'menu_order',
		'sort_order'       => 'ASC',
		'show_option_none' => __( 'Select Page', 'learnpress' ),
		'class'            => $class,
		'echo'             => false,
		'selected'         => $selected,
		'allow_create'     => true,
	);
	$output  = wp_dropdown_pages( $args );
	$replace = '';

if ( $class ) {
		$replace .= ' class="' . $class . '"';
	}

if ( $css ) {
		$replace .= ' style="' . $css . '"';
	}

$replace .= ' data-selected="' . $selected . '"';
	$replace .= " data-placeholder='" . __( 'Select a page&hellip;', 'learnpress' ) . "' id=";
	$output   = '<div class="list-pages-wrapper">' . str_replace( ' id=', $replace, $output );

if ( $before ) {
		$before_output = array();

foreach ( $before as $v => $l ) {
			$before_output[] = sprintf( '<option value="%s">%s</option>', $v, $l );
		}

$before_output = join( "\n", $before_output );
		$output        = preg_replace(
			'!(<option class=".*" value="[0-9]+".*>.*</option>)!',
			$before_output . "\n$1",
			$output,
			1
		);
	}

$output = str_replace( '<option class="level-0" value="00000">#0 (no title)</option>', '', $output );

if ( $selected && get_post_status( $selected ) !== 'publish' ) {
		$selected = 0;
	}

if ( $allow_create ) {
		ob_start(); ?>

<?php echo esc_html( _x( 'or', 'dropdown pages', 'learnpress' ) ); ?>

<button class="button button-quick-add-page" data-id="<?php echo esc_attr( $id ); ?>" type="button">
			<?php esc_html_e( 'Create new', 'learnpress' ); ?>
		</button>
		<?php echo '</div>'; ?>

<p class="quick-add-page-actions <?php echo esc_attr( $id ); ?><?php echo esc_attr( $selected ? '' : ' hide-if-js' ); ?>">
			<a class="edit-page" href="<?php echo get_edit_post_link( $selected ); ?>"
				target="_blank"><?php esc_html_e( 'Edit page', 'learnpress' ); ?></a>
			&#124;
			<a class="view-page" href="<?php echo get_permalink( $selected ); ?>"
				target="_blank"><?php esc_html_e( 'View page', 'learnpress' ); ?></a>
		</p>
		
		<div class="field_name" name="<?php echo esc_attr( $id ); ?>"></div>

<?php
		$output .= ob_get_clean();
	} else {
		$output .= '</div>';
	}

$output = sprintf( '<div class="learn-press-dropdown-pages">%s</div>', $output );

if ( $echo ) {
		$allowed_html           = wp_kses_allowed_html( 'post' );
		$allowed_html['select'] = [
			'name' => [],
		];
		$allowed_html['option'] = [
			'value'    => [],
			'selected' => [],
			'class'    => [],
		];
		$allowed_html['input']  = [
			'type'        => [],
			'placeholder' => [],
			'name'        => [],
			'class'       => [],
		];
		$allowed_html['div']    = [
			'name'  => [],
			'class' => [],
		];

echo wp_kses( $output, $allowed_html );
	}

return $output;
}

/**
 * List all registered question types into dropdown
 *
 * @param array
 *
 * @return string
 */
function learn_press_dropdown_question_types( $args = array() ) {
	$args = wp_parse_args(
		$args,
		array(
			'name'     => 'learn-press-dropdown-question-types',
			'id'       => '',
			'class'    => '',
			'selected' => '',
			'echo'     => true,
		)
	);

if ( ! $args['id'] ) {
		$args['id'] = $args['name'];
	}

$args['class'] = 'lp-dropdown-question-types' . ( $args['class'] ? ' ' . $args['class'] : '' );
	$types         = learn_press_question_types();
	$output        = sprintf(
		'<select name="%s" id="%s" class="%s"%s>',
		$args['name'],
		$args['id'],
		$args['class'],
		$args['selected'] ? 'data-selected="' . $args['selected'] . '"' : ''
	);

foreach ( $types as $slug => $name ) {
		$output .= sprintf(
			'<option value="%s"%s>%s</option>',
			$slug,
			selected( $slug == $args['selected'], true, false ),
			$name
		);
	}

$output .= '</select>';

if ( $args['echo'] ) {
		echo wp_kses_post( $output );
	}

return $output;
}

/**
 * List all registered question types into dropdown
 *
 * @param array       $args
 * @param LP_Question $question
 *
 * @return string
 */
function learn_press_field_question_duration( $args = array(), $question = null ) {
	global $post;

$duration_type = get_post_meta( $post->ID, '_lp_duration_type', true );
	$value         = get_post_meta( $question->id, '_question_duration', true );

$wrap_class = 'learn-press-question-duration';

if ( 'questions_duration' !== $duration_type ) {
		$wrap_class .= ' hide';
	}

$args = wp_parse_args(
		$args,
		array(
			'name'        => 'learn_press_question[' . $question->id . '][duration]',
			'id'          => 'learn-press-question-duration-' . $question->id,
			'class'       => 'learn-press-question-duration',
			'selected'    => '',
			'echo'        => true,
			'value'       => 0,
			'step'        => 1,
			'min'         => 0,
			'placeholder' => __( 'Minutes', 'learnpress' ),
		)
	);

$args['value'] = $value;

if ( ! $args['id'] ) {
		$args['id'] = $args['name'];
	}

return '<span class="' . esc_attr( $wrap_class ) . '">' . sprintf(
		'<input type="number" class="%s" name="%s" id="%s" value="%s" step="%s" min="%s" max="%s" placeholder="%s"/>',
		$args['class'],
		$args['name'],
		empty( $args['clone'] ) ? $args['id'] : '',
		$args['value'],
		$args['step'],
		$args['min'],
		! empty( $args['max'] ) ? $args['max'] : '',
		$args['placeholder']
	) . $args['placeholder'] . '</span>';
}

/**
 * Displays email formats support into a dropdown
 *
 * @param array $args
 *
 * @return string
 */
function learn_press_email_formats_dropdown( $args = array() ) {
	$args = wp_parse_args(
		$args,
		array(
			'name'        => 'learn-press-dropdown-email-formats',
			'id'          => '',
			'class'       => '',
			'selected'    => '',
			'option_none' => '',
			'echo'        => true,
		)
	);

$formats = array(
		'plain_text' => __( 'Plain Text', 'learnpress' ),
		'html'       => __( 'HTML', 'learnpress' ),
	);

if ( empty( $args['id'] ) ) {
		$args['id'] = sanitize_file_name( $args['name'] );
	}

$output = sprintf( '<select name="%s" id="%s" class="%s" %s>', $args['name'], $args['id'], $args['class'], '' );

if ( $args['option_none'] ) {
		if ( is_array( $args['option_none'] ) ) {
			$text  = reset( $args['option_none'] );
			$value = key( $args['option_none'] );
		} else {
			$text  = $args['option_none'];
			$value = '';
		}

$output .= sprintf( '<option value="%s">%s</option>', $value, $text );
	}

foreach ( $formats as $name => $text ) {
		$output .= sprintf(
			'<option value="%s" %s>%s</option>',
			$name,
			selected( $args['selected'] == $name, true, false ),
			$text
		) . "\n";
	}
	$output .= '</select>';

if ( $args['echo'] ) {
		echo wp_kses_post( $output );
	}

return $output;
}

/**
 * Return array of email formats.
 *
 * @return mixed
 */
function learn_press_email_formats() {
	$formats = array(
		'plain' => esc_html__( 'Plain Text', 'learnpress' ),
		'html'  => esc_html__( 'HTML', 'learnpress' ),
	);

return apply_filters( 'learn-press/email-formats', $formats );
}

function learn_press_trim_content( $content, $count = 0 ) {
	$content = preg_replace( '/(?<=\S,)(?=\S)/', ' ', $content );
	$content = str_replace( "\n", ' ', $content );
	$content = explode( ' ', $content );

$count = $count > 0 ? $count : sizeof( $content ) - 1;
	$full  = $count >= sizeof( $content ) - 1;

$content = array_slice( $content, 0, $count );
	$content = implode( ' ', $content );

if ( ! $full ) {
		$content .= '...';
	}

return $content;
}

/**
 * Get list of themes that support LearnPress.
 *
 * @return mixed
 */
function learn_press_get_education_themes() {

// New theme can be added here
	return apply_filters(
		'learn-press/education-themes',
		array(
			'23451388' => 'kindergarten',
			'22773871' => 'ivy-school',
			'20370918' => 'wordpress-lms',
			'14058034' => 'eduma',
			'17097658' => 'coach',
			'11797847' => 'lms',
		)
	);
}

if ( ! function_exists( 'learn_press_get_item_referral' ) ) {
	/**
	 * Set item link referral.
	 *
	 * @param int|string $item_id
	 *
	 * @return string
	 */
	function learn_press_get_item_referral( $item_id ) {
		$affiliate_links = array(
			14058034 => 'https://1.envato.market/G5Ook', // Eduma
			22773871 => 'https://1.envato.market/akrzZ', // Ivy-school
			20370918 => 'https://1.envato.market/13Zkd', // Course Builder LMS
			17097658 => 'https://1.envato.market/Xq2Ra', // Coach
			23451388 => 'https://1.envato.market/oWov9', // StarKid
			11797847 => 'https://1.envato.market/zknvM', // Epsilon
			13321455 => 'https://1.envato.market/G5Rkk', // Sailing
			19029758 => 'https://1.envato.market/mAYdZ', // Travel Tour Booking
			12124219 => 'https://1.envato.market/qJYdO', // Resca
			18828322 => 'https://1.envato.market/VW2K3', // LuxStay
			8254575  => 'https://1.envato.market/xWYdO', // Squareroot
			13782850 => 'https://1.envato.market/Qo71z',
			14025178 => 'https://1.envato.market/9R0oQ',
			17739078 => 'https://1.envato.market/jkYda',
			16210005 => 'https://1.envato.market/56oJD',
			11733602 => 'https://1.envato.market/keYdv',
			13513609 => 'https://1.envato.market/aq7dQ',
			19693761 => 'https://1.envato.market/A976D',
			12532973 => 'https://1.envato.market/Ge79B',
			19305239 => 'https://1.envato.market/10JAB',
			23716060 => 'https://1.envato.market/ZO7WW',
			20466233 => 'https://1.envato.market/gjYd0',
			21070438 => 'https://1.envato.market/xPz65',
			20794183 => 'https://1.envato.market/o1YdY',
			20979215 => 'https://1.envato.market/03R5V',
			11151269 => 'https://1.envato.market/Br7L4',
			8905392  => 'https://1.envato.market/zEYd7',
			23168294 => 'https://1.envato.market/Wn7on',
			17719422 => 'https://1.envato.market/0WVaL',
			21680592 => 'https://1.envato.market/qqO6y',
		);

return $affiliate_links[ $item_id ] ?? 'https://themeforest.net/user/thimpress/portfolio/';
	}
}

/**
 * Count number of orders between to dates
 *
 * @param string
 * @param int
 *
 * @return int
 */
function learn_press_get_order_by_time( $by, $time ) {
	global $wpdb;

$user_id = get_current_user_id();

$y = gmdate( 'Y', $time );
	$m = gmdate( 'm', $time );
	$d = gmdate( 'd', $time );

switch ( $by ) {
		case 'days':
			$orders = $wpdb->get_var(
				$wpdb->prepare(
					"SELECT COUNT(*)
					FROM $wpdb->posts AS p
					INNER JOIN $wpdb->postmeta AS m ON p.ID = m.post_id
					WHERE p.post_author = %d
					AND p.post_type = %s
					AND p.post_status = %s
					AND m.meta_key = %s
					AND m.meta_value = %s
					AND YEAR(p.post_date) = %s AND MONTH(p.post_date) = %s AND DAY(p.post_date) = %s",
					$user_id,
					LP_ORDER_CPT,
					'publish',
					'_learn_press_transaction_status',
					'completed',
					$y,
					$m,
					$d
				)
			);
			break;
		case 'months':
			$orders = $wpdb->get_var(
				$wpdb->prepare(
					"SELECT COUNT(*)
					FROM $wpdb->posts AS p
					INNER JOIN $wpdb->postmeta AS m ON p.ID = m.post_id
					WHERE p.post_author = %d
					AND p.post_type = %s
					AND p.post_status = %s
					AND m.meta_key = %s
					AND m.meta_value = %s
					AND YEAR(p.post_date) = %s AND MONTH(p.post_date) = %s",
					$user_id,
					LP_ORDER_CPT,
					'publish',
					'_learn_press_transaction_status',
					'completed',
					$y,
					$m
				)
			);
			break;
	}

return $orders;
}

/**
 * Count number of orders by status
 *
 * @param string Status of the orders
 *
 * @return int
 */
function learn_press_get_courses_by_status( $status ) {
	global $wpdb;

$user_id = get_current_user_id();

$courses = $wpdb->get_var(
		$wpdb->prepare(
			"SELECT COUNT(*)
			FROM $wpdb->posts
			WHERE post_author = %d
			AND post_type = %s
			AND post_status = %s",
			$user_id,
			LP_COURSE_CPT,
			$status
		)
	);

return $courses;
}

/**
 * Count number of orders by price
 *
 * @param string
 *
 * @return int
 */
function learn_press_get_courses_by_price( $fee ) {
	global $wpdb;

$user_id = get_current_user_id();

$courses = $wpdb->get_var(
		$wpdb->prepare(
			"SELECT COUNT(*)
			FROM $wpdb->posts AS p
			INNER JOIN $wpdb->postmeta AS m ON p.ID = m.post_id
			WHERE p.post_author = %d
			AND p.post_type = %s
			AND p.post_status IN (%s, %s)
			AND m.meta_key = %s
			AND m.meta_value = %s",
			$user_id,
			LP_COURSE_CPT,
			'publish',
			'pending',
			'_lpr_course_payment',
			$fee
		)
	);

return $courses;
}

/**
 * Get data about students to render in chart
 *
 * @param null  $from
 * @param null  $by
 * @param float $time_ago
 *
 * @return array
 */
function learn_press_get_chart_students( $from = null, $by = null, $time_ago = 0 ) {
	$labels   = array();
	$datasets = array();

if ( is_null( $from ) ) {
		$from = current_time( 'mysql', 1 );
	}

if ( is_null( $by ) ) {
		$by = 'days';
	}

switch ( $by ) {
		case 'days':
			$date_format = 'M d';
			break;
		case 'months':
			$date_format = 'M Y';
			break;
		case 'years':
			$date_format = 'Y';
			break;
	}

for ( $i = - $time_ago + 1; $i <= 0; $i ++ ) {
		$labels[]              = gmdate( $date_format, strtotime( "$i $by", strtotime( $from ) ) );
		$datasets[0]['data'][] = learn_press_get_order_by_time( $by, strtotime( "$i $by", strtotime( $from ) ) );
	}

$colors                              = learn_press_get_admin_colors();
	$datasets[0]['fillColor']            = 'rgba(255,255,255,0.1)';
	$datasets[0]['strokeColor']          = $colors[0];
	$datasets[0]['pointColor']           = $colors[0];
	$datasets[0]['pointStrokeColor']     = $colors[2];
	$datasets[0]['pointHighlightFill']   = $colors[2];
	$datasets[0]['pointHighlightStroke'] = $colors[0];

return array(
		'labels'   => $labels,
		'datasets' => $datasets,
	);
}

/**
 * Get data about students to render in chart
 *
 * @param null  $from
 * @param null  $by
 * @param float $time_ago
 *
 * @return array
 */
function learn_press_get_chart_users( $from = null, $by = null, $time_ago = 0 ) {
	global $wpdb;

$labels   = array();
	$datasets = array();

if ( is_null( $from ) ) {
		$from = current_time( 'mysql', 1 );
	}

if ( is_null( $by ) ) {
		$by = 'days';
	}

$results = array(
		'all'         => array(),
		'instructors' => array(),
	);

$from_time = is_numeric( $from ) ? $from : strtotime( $from );

switch ( $by ) {
		case 'days':
			$date_format = 'M d Y';
			$_from       = - $time_ago + 1;
			$_from       = gmdate( 'Y-m-d', strtotime( "{$_from} {$by}", $from_time ) );
			$_to         = date( 'Y-m-d', $from_time );
			$_sql_format = '%Y-%m-%d';
			$_key_format = 'Y-m-d';
			break;
		case 'months':
			$date_format = 'M Y';
			$_from       = - $time_ago + 1;
			$_from       = date( 'Y-m-01', strtotime( "{$_from} {$by}", $from_time ) );
			$days        = date( 't', mktime( 0, 0, 0, date( 'm', $from_time ), 1, date( 'Y', $from_time ) ) );
			$_to         = date( 'Y-m-' . $days, $from_time );
			$_sql_format = '%Y-%m';
			$_key_format = 'Y-m';
			break;
		case 'years':
			$date_format = 'Y';
			$_from       = - $time_ago + 1;
			$_from       = date( 'Y-01-01', strtotime( "{$_from} {$by}", $from_time ) );
			$days        = date( 't', mktime( 0, 0, 0, date( 'm', $from_time ), 1, date( 'Y', $from_time ) ) );
			$_to         = date( 'Y-12-' . $days, $from_time );
			$_sql_format = '%Y';
			$_key_format = 'Y';

break;
	}
	$query = $wpdb->prepare(
		"
		SELECT count(u.ID) as c, DATE_FORMAT( u.user_registered, %s) as d
		FROM {$wpdb->users} u
		WHERE 1
		GROUP BY d
		HAVING d BETWEEN %s AND %s
		ORDER BY d ASC
			",
		$_sql_format,
		$_from,
		$_to
	);

if ( $_results = $wpdb->get_results( $query ) ) {
		foreach ( $_results as $k => $v ) {
			$results['all'][ $v->d ] = $v;
		}
	}

$query = $wpdb->prepare(
		"
			SELECT count(u.ID) as c, DATE_FORMAT( u.user_registered, %s) as d
			FROM {$wpdb->users} u
			INNER JOIN {$wpdb->usermeta} um ON um.user_id = u.ID AND um.meta_key = %s AND ( um.meta_value LIKE %s OR um.meta_value LIKE %s )
			WHERE 1
			GROUP BY d
			HAVING d BETWEEN %s AND %s
			ORDER BY d ASC
			",
		$_sql_format,
		'wp_capabilities',
		'%' . $wpdb->esc_like( 's:13:"administrator"' ) . '%',
		'%' . $wpdb->esc_like( 's:10:"lp_teacher"' ) . '%',
		$_from,
		$_to
	);

if ( $_results = $wpdb->get_results( $query ) ) {
		foreach ( $_results as $k => $v ) {
			$results['instructors'][ $v->d ] = $v;
		}
	}

for ( $i = - $time_ago + 1; $i <= 0; $i ++ ) {
		$date     = strtotime( "$i $by", $from_time );
		$labels[] = date( $date_format, $date );
		$key      = date( $_key_format, $date );

$all         = ! empty( $results['all'][ $key ] ) ? $results['all'][ $key ]->c : 0;
		$instructors = ! empty( $results['instructors'][ $key ] ) ? $results['instructors'][ $key ]->c : 0;

$datasets[0]['data'][] = $all;
		$datasets[1]['data'][] = $instructors;
		$datasets[2]['data'][] = $all - $instructors;
	}

foreach ( $dataset_params as $k => $v ) {
		$datasets[ $k ]['fillColor']            = sprintf( $v['color1'], '0.2' );
		$datasets[ $k ]['strokeColor']          = sprintf( $v['color1'], '1' );
		$datasets[ $k ]['pointColor']           = sprintf( $v['color1'], '1' );
		$datasets[ $k ]['pointStrokeColor']     = $v['color2'];
		$datasets[ $k ]['pointHighlightFill']   = $v['color2'];
		$datasets[ $k ]['pointHighlightStroke'] = sprintf( $v['color1'], '1' );
		$datasets[ $k ]['label']                = $v['label'];
	}

return array(
		'labels'   => $labels,
		'datasets' => $datasets,
		'sql'      => $query,
	);
}

/**
 * Get data about students to render in chart
 *
 * @param null  $from
 * @param null  $by
 * @param float $time_ago
 *
 * @return array
 */
function learn_press_get_chart_courses( $from = null, $by = null, $time_ago = 0 ) {
	global $wpdb;

$labels   = array();
	$datasets = array();

if ( is_null( $from ) ) {
		$from = current_time( 'mysql', 1 );
	}

if ( is_null( $by ) ) {
		$by = 'days';
	}

$results = array(
		'all'     => array(),
		'public'  => array(),
		'pending' => array(),
		'free'    => array(),
		'paid'    => array(),
	);

$from_time = is_numeric( $from ) ? $from : strtotime( $from );

switch ( $by ) {
		case 'days':
			$date_format = 'M d Y';
			$_from       = - $time_ago + 1;
			$_from       = date( 'Y-m-d', strtotime( "{$_from} {$by}", $from_time ) );
			$_to         = date( 'Y-m-d', $from_time );
			$_sql_format = '%Y-%m-%d';
			$_key_format = 'Y-m-d';
			break;
		case 'months':
			$date_format = 'M Y';
			$_from       = - $time_ago + 1;
			$_from       = date( 'Y-m-01', strtotime( "{$_from} {$by}", $from_time ) );
			$days        = date( 't', mktime( 0, 0, 0, date( 'm', $from_time ), 1, date( 'Y', $from_time ) ) );
			$_to         = date( 'Y-m-' . $days, $from_time );
			$_sql_format = '%Y-%m';
			$_key_format = 'Y-m';
			break;
		case 'years':
			$date_format = 'Y';
			$_from       = - $time_ago + 1;
			$_from       = date( 'Y-01-01', strtotime( "{$_from} {$by}", $from_time ) );
			$days        = date( 't', mktime( 0, 0, 0, date( 'm', $from_time ), 1, date( 'Y', $from_time ) ) );
			$_to         = date( 'Y-12-' . $days, $from_time );
			$_sql_format = '%Y';
			$_key_format = 'Y';

break;
	}

$query_where = '';

if ( current_user_can( LP_TEACHER_ROLE ) ) {
		$user_id      = learn_press_get_current_user_id();
		$query_where .= $wpdb->prepare( ' AND c.post_author=%d ', $user_id );
	}

$query = $wpdb->prepare(
		"
		SELECT count(c.ID) as c, DATE_FORMAT( c.post_date, %s) as d
		FROM {$wpdb->posts} c
		WHERE 1
		{$query_where}
		AND c.post_status IN('publish', 'pending') AND c.post_type = %s
		GROUP BY d
		HAVING d BETWEEN %s AND %s
		ORDER BY d ASC
			",
		$_sql_format,
		'lp_course',
		$_from,
		$_to
	);
	if ( $_results = $wpdb->get_results( $query ) ) {
		foreach ( $_results as $k => $v ) {
			$results['all'][ $v->d ] = $v;
		}
	}
	$query = $wpdb->prepare(
		"
		SELECT count(c.ID) as c, DATE_FORMAT( c.post_date, %s) as d
		FROM {$wpdb->posts} c
		WHERE 1
		{$query_where}
		AND c.post_status = %s AND c.post_type = %s
		GROUP BY d
		HAVING d BETWEEN %s AND %s
		ORDER BY d ASC
			",
		$_sql_format,
		'publish',
		'lp_course',
		$_from,
		$_to
	);

$_results = $wpdb->get_results( $query );
	if ( $_results ) {
		foreach ( $_results as $k => $v ) {
			$results['publish'][ $v->d ] = $v;
		}
	}

$query = $wpdb->prepare(
		"
			SELECT count(c.ID) as c, DATE_FORMAT( c.post_date, %s) as d
			FROM {$wpdb->posts} c
			INNER JOIN {$wpdb->postmeta} cm ON cm.post_id = c.ID
			WHERE 1
			{$query_where}
			AND c.post_status = %s AND c.post_type = %s
			GROUP BY d
			HAVING d BETWEEN %s AND %s
			ORDER BY d ASC
			",
		$_sql_format,
		'publish',
		'lp_course',
		$_from,
		$_to
	);

$_results = $wpdb->get_results( $query );
	if ( $_results ) {
		foreach ( $_results as $k => $v ) {
			$results['paid'][ $v->d ] = $v;
		}
	}

for ( $i = - $time_ago + 1; $i <= 0; $i ++ ) {
		$date     = strtotime( "$i $by", $from_time );
		$labels[] = date( $date_format, $date );
		$key      = date( $_key_format, $date );

$all     = ! empty( $results['all'][ $key ] ) ? $results['all'][ $key ]->c : 0;
		$publish = ! empty( $results['publish'][ $key ] ) ? $results['publish'][ $key ]->c : 0;
		$paid    = ! empty( $results['paid'][ $key ] ) ? $results['paid'][ $key ]->c : 0;

$datasets[0]['data'][] = $all;
		$datasets[1]['data'][] = $publish;
		$datasets[2]['data'][] = $all - $publish;
		$datasets[3]['data'][] = $paid;
		$datasets[4]['data'][] = $all - $paid;
	}

$dataset_params = array(
		array(
			'color1' => 'rgba(47, 167, 255, %s)',
			'color2' => '#FFF',
			'label'  => __( 'All', 'learnpress' ),
		),
		array(
			'color1' => 'rgba(212, 208, 203, %s)',
			'color2' => '#FFF',
			'label'  => __( 'Publish', 'learnpress' ),
		),
		array(
			'color1' => 'rgba(234, 199, 155, %s)',
			'color2' => '#FFF',
			'label'  => __( 'Pending', 'learnpress' ),
		),
		array(
			'color1' => 'rgba(234, 199, 155, %s)',
			'color2' => '#FFF',
			'label'  => __( 'Paid', 'learnpress' ),
		),
		array(
			'color1' => 'rgba(234, 199, 155, %s)',
			'color2' => '#FFF',
			'label'  => __( 'Free', 'learnpress' ),
		),
	);

return array(
		'labels'   => $labels,
		'datasets' => $datasets,
		'sql'      => $query,
	);
}

/**
 * Get data about students to render in chart
 *
 * @param null  $from
 * @param null  $by
 * @param float $time_ago
 *
 * @return array
 */
function learn_press_get_chart_orders( $from = null, $by = null, $time_ago = 0 ) {
	global $wpdb;
	$sql_join = '';

$report_sales_by = learn_press_get_request( 'report_sales_by' );
	$course_id       = learn_press_get_request( 'course_id' );
	$cat_id          = learn_press_get_request( 'cat_id' );

$labels   = array();
	$datasets = array();
	if ( is_null( $from ) ) {
		$from = current_time( 'mysql', 1 );
	}
	if ( is_null( $by ) ) {
		$by = 'days';
	}
	$results   = array(
		'all'       => array(),
		'completed' => array(),
		'pending'   => array(),
	);
	$from_time = is_numeric( $from ) ? $from : strtotime( $from );

break;
	}

$query_join  = '';
	$query_where = '';
	$sql_join    = '';
	if ( 'course' === $report_sales_by ) {
		$sql_join .= " INNER JOIN `{$wpdb->prefix}learnpress_order_items` `lpoi` "
					 . ' ON o.ID=lpoi.order_id '
					 . " INNER JOIN {$wpdb->prefix}learnpress_order_itemmeta loim "
					 . ' ON lpoi.order_item_id=loim.learnpress_order_item_id '
					 . " AND loim.meta_key='_course_id' "
					 . ' AND CAST(loim.meta_value AS SIGNED)=%d ';
		if ( current_user_can( LP_TEACHER_ROLE ) ) {
			$user_id   = learn_press_get_current_user_id();
			$sql_join .= $wpdb->prepare(
				' AND CAST(loim.meta_value AS SIGNED) IN '
				. ' ( '
				. " SELECT ID FROM {$wpdb->posts} p WHERE p.ID = CAST(loim.meta_value AS SIGNED) AND `post_author`=" . intval( $user_id )
				. ' ) '
			);
		}
		$query_join .= $wpdb->prepare( $sql_join, $course_id );

} elseif ( 'category' === $report_sales_by ) {
		$sql_join .= " INNER JOIN `{$wpdb->prefix}learnpress_order_items` `lpoi` "
					   . ' ON o.ID=lpoi.order_id '
					   . " INNER JOIN {$wpdb->prefix}learnpress_order_itemmeta loim "
					   . ' ON lpoi.order_item_id=loim.learnpress_order_item_id '
					   . " AND loim.meta_key='_course_id' "
					   . ' AND CAST(loim.meta_value AS SIGNED) IN('
					   // sub query
					   . ' SELECT tr.object_id '
					   . " FROM {$wpdb->prefix}term_taxonomy tt INNER JOIN {$wpdb->prefix}term_relationships tr "
					   . " ON tt.term_taxonomy_id = tr.term_taxonomy_id AND tt.taxonomy='course_category' "
					   . ' WHERE tt.term_id=%d)';
		$query_join .= $wpdb->prepare( $sql_join, $cat_id );
	}
	if ( current_user_can( LP_TEACHER_ROLE ) ) {
		$user_id      = learn_press_get_current_user_id();
		$query_where .= $wpdb->prepare(
			" AND o.ID IN( SELECT oi.order_id
										FROM lptest.{$wpdb->prefix}learnpress_order_items oi
											inner join {$wpdb->prefix}learnpress_order_itemmeta oim
												on oi.order_item_id = oim.learnpress_order_item_id
													and oim.meta_key='_course_id'
													and cast(oim.meta_value as SIGNED) IN (
														SELECT sp.ID FROM {$wpdb->prefix}posts sp WHERE sp.post_author=%d and sp.ID=cast(oim.meta_value as SIGNED)
													)
										) ",
			$user_id
		);
	}

$query = $wpdb->prepare(
		"
				SELECT count(o.ID) as c, DATE_FORMAT( o.post_date, %s) as d
				FROM {$wpdb->posts} o {$query_join}
				WHERE 1 {$query_where}
				AND o.post_status IN('lp-completed') AND o.post_type = %s
				GROUP BY d
				HAVING d BETWEEN %s AND %s
				ORDER BY d ASC
			",
		$_sql_format,
		'lp_order',
		$_from,
		$_to
	);

if ( $_results = $wpdb->get_results( $query ) ) {
		foreach ( $_results as $k => $v ) {
			$results['completed'][ $v->d ] = $v;
		}
	}

$query = $wpdb->prepare(
		"
		SELECT count(o.ID) as c, DATE_FORMAT( o.post_date, %s) as d
		FROM {$wpdb->posts} o {$query_join}
		WHERE 1 {$query_where}
		AND o.post_status IN('lp-pending', 'lp-processing') AND o.post_type = %s
		GROUP BY d
		HAVING d BETWEEN %s AND %s
		ORDER BY d ASC
			",
		$_sql_format,
		'lp_order',
		$_from,
		$_to
	);

if ( $_results = $wpdb->get_results( $query ) ) {
		foreach ( $_results as $k => $v ) {
			$results['pending'][ $v->d ] = $v;
		}
	}

for ( $i = - $time_ago + 1; $i <= 0; $i ++ ) {
		$date     = strtotime( "$i $by", $from_time );
		$labels[] = date( $date_format, $date );
		$key      = date( $_key_format, $date );

$completed = ! empty( $results['completed'][ $key ] ) ? $results['completed'][ $key ]->c : 0;
		$pending   = ! empty( $results['pending'][ $key ] ) ? $results['pending'][ $key ]->c : 0;
		$all       = $completed + $pending;

$datasets[0]['data'][] = $all;
		$datasets[1]['data'][] = $completed;
		$datasets[2]['data'][] = $pending;
	}

return array(
		'labels'   => $labels,
		'datasets' => $datasets,
		'sql'      => $query,
	);
}

/**
 * Get data about courses to render in the chart
 *
 * @return array
 */
function learn_press_get_chart_courses2() {
	$labels = array(
		__( 'Pending Courses/Publish Courses', 'learnpress' ),
		__( 'Free Courses/Paid Courses', 'learnpress' ),
	);

$datasets            = array();
	$datasets[0]['data'] = array(
		learn_press_get_courses_by_status( 'pending' ),
		learn_press_get_courses_by_price( 'free' ),
	);

$datasets[1]['data'] = array(
		learn_press_get_courses_by_status( 'publish' ),
		learn_press_get_courses_by_price( 'not_free' ),
	);

$colors                     = learn_press_get_admin_colors();
	$datasets[0]['fillColor']   = $colors[1];
	$datasets[0]['strokeColor'] = $colors[1];
	$datasets[1]['fillColor']   = $colors[3];
	$datasets[1]['strokeColor'] = $colors[3];

return array(
		'labels'   => $labels,
		'datasets' => $datasets,
	);
}

/**
 * Get colors setting up by admin user
 *
 * @return array
 */
function learn_press_get_admin_colors() {
	$admin_color = get_user_meta( get_current_user_id(), 'admin_color', true );
	global $_wp_admin_css_colors;
	$colors = array();

if ( ! empty( $_wp_admin_css_colors[ $admin_color ]->colors ) ) {
		$colors = $_wp_admin_css_colors[ $admin_color ]->colors;
	}

if ( empty( $colors[0] ) ) {
		$colors[0] = '#000000';
	}

if ( empty( $colors[2] ) ) {
		$colors[2] = '#00FF00';
	}

return $colors;
}

/**
 * Convert an array to json format and print out to browser
 *
 * @param array $chart
 */
function learn_press_process_chart( $chart = array() ) {
	$data = json_encode(
		array(
			'labels'   => $chart['labels'],
			'datasets' => $chart['datasets'],
		)
	);
	echo wp_kses_post( $data );
}

/**
 * Print out the configuration for admin chart
 */
function learn_press_config_chart() {
	$colors = learn_press_get_admin_colors();

$config = array(
		'scaleShowGridLines'      => true,
		'scaleGridLineColor'      => '#777',
		'scaleGridLineWidth'      => 0.3,
		'scaleFontColor'          => '#444',
		'scaleLineColor'          => $colors[0],
		'bezierCurve'             => true,
		'bezierCurveTension'      => 0.2,
		'pointDotRadius'          => 5,
		'pointDotStrokeWidth'     => 5,
		'pointHitDetectionRadius' => 20,
		'datasetStroke'           => true,
		'responsive'              => true,
		'tooltipFillColor'        => $colors[2],
		'tooltipFontColor'        => '#eee',
		'tooltipCornerRadius'     => 0,
		'tooltipYPadding'         => 10,
		'tooltipXPadding'         => 10,
		'barDatasetSpacing'       => 10,
		'barValueSpacing'         => 200,

);

echo json_encode( $config );
}

function set_post_order_in_admin( $wp_query ) {
	global $pagenow;

if ( isset( $_GET['post_type'] ) ) {
		$post_type = LP_Helper::sanitize_params_submitted( $_GET['post_type'] );
	} else {
		$post_type = '';
	}

if ( is_admin() && 'edit.php' == $pagenow && $post_type == LP_COURSE_CPT && ! isset( $_GET['orderby'] ) ) {
		$wp_query->set( 'orderby', 'date' );
		$wp_query->set( 'order', 'DSC' );
	}
}

// add_filter( 'pre_get_posts', 'set_post_order_in_admin' );

function learn_press_copy_post_meta( $from_id, $to_id ) {
	global $wpdb;

$course_meta = $wpdb->get_results(
		$wpdb->prepare( "SELECT meta_key, meta_value FROM $wpdb->postmeta WHERE post_id = %d", $from_id )
	);

if ( count( $course_meta ) != 0 ) {
		$sql_query     = "INSERT INTO $wpdb->postmeta (post_id, meta_key, meta_value) ";
		$sql_query_sel = array();

foreach ( $course_meta as $meta ) {
			$meta_key   = $meta->meta_key;
			$meta_value = addslashes( $meta->meta_value );

$sql_query_sel[] = "SELECT {$to_id}, '$meta_key', '$meta_value'";
		}

$sql_query .= implode( ' UNION ALL ', $sql_query_sel );
		$wpdb->query( $sql_query );
	}
}

/**
 * Check to see if a plugin is already installed or not
 *
 * @param $plugin
 *
 * @return bool
 */
function learn_press_is_plugin_install( $plugin ) {
	$installed_plugins = get_plugins();

return isset( $installed_plugins[ $plugin ] );
}

/**
 * Get plugin file that contains the information from slug
 *
 * @param $slug
 *
 * @return mixed
 */
function learn_press_plugin_basename_from_slug( $slug ) {
	$keys = array_keys( get_plugins() );

foreach ( $keys as $key ) {
		if ( preg_match( '|^' . $slug . '/|', $key ) ) {
			return $key;
		}
	}

return $slug;
}

function _learn_press_reset_course_data() {
	if ( empty( $_REQUEST['reset-course-data'] ) ) {
		return false;
	}

learn_press_reset_course_data( intval( $_REQUEST['reset-course-data'] ) );

wp_redirect( esc_url_raw( remove_query_arg( 'reset-course-data' ) ) );
}

add_action( 'init', '_learn_press_reset_course_data' );

function learn_press_admin_section_loop_item_class( $item, $section ) {
	$classes = array(
		'lp-section-item',
	);

$classes[] = 'lp-item-' . $item->post_type;

if ( ! absint( $item->ID ) ) {
		$classes[] = 'lp-item-empty lp-item-new focus';
	}

$classes = apply_filters( 'learn_press_section_loop_item_class', $classes, $item, $section );

if ( $classes ) {
		echo 'class="' . join( ' ', $classes ) . '"';
	}

return $classes;
}

function learn_press_disable_checked_ontop( $args ) {

if ( 'course_category' == $args['taxonomy'] ) {
		$args['checked_ontop'] = false;
	}

return $args;
}

add_filter( 'wp_terms_checklist_args', 'learn_press_disable_checked_ontop' );

function learn_press_get_screens() {
	$screen_id = sanitize_title( __( 'LearnPress', 'learnpress' ) );

$screens = array(
		'toplevel_page_' . $screen_id,
		$screen_id . '_page_learn-press-statistics',
		$screen_id . '_page_learn-press-addons',
		$screen_id . '_page_learn-press-settings',
		$screen_id . '_page_learn-press-tools',
	);

foreach ( array( LP_COURSE_CPT, LP_LESSON_CPT, LP_QUIZ_CPT, LP_QUESTION_CPT, LP_ORDER_CPT ) as $post_type ) {
		$screens[] = 'edit-' . $post_type;
		$screens[] = $post_type;
	}

return apply_filters( 'learn_press_screen_ids', $screens );
}

function learn_press_is_post_type_screen( $post_type, $union = 'OR' ) {
	if ( is_array( $post_type ) ) {
		$return = null;

foreach ( $post_type as $_post_type ) {
			$check = learn_press_is_post_type_screen( $_post_type );

if ( $union == 'OR' && $check ) {
				return true;
			}

if ( $return == null ) {
				$return = $check;
			} else {
				$return = $return && $check;
			}

if ( $union !== 'OR' ) {
				return $return;
			}
		}

return $return;
	}

$screen = get_current_screen();

if ( ! $screen ) {
		return;
	}

$screen_id = $screen->id;

return in_array( $screen_id, array( $post_type, "edit-{$post_type}" ) );
}

function learn_press_get_notice_dismiss( $context, $type = 'transient' ) {
	if ( $type == 'transient' ) {
		return get_transient( 'learn_press_dismiss_notice_' . $context );
	}

return get_option( 'learn_press_dismiss_notice_' . $context );
}

if ( ! function_exists( 'learn_press_course_insert_section' ) ) {
	function learn_press_course_insert_section( $section = array() ) {
		global $wpdb;

$section = wp_parse_args(
			$section,
			array(
				'section_name'        => '',
				'section_course_id'   => 0,
				'section_order'       => 0,
				'section_description' => '',
			)
		);

$section = stripslashes_deep( $section );

extract( $section );

$insert_data = compact( 'section_name', 'section_course_id', 'section_order', 'section_description' );

$wpdb->insert(
			$wpdb->learnpress_sections,
			$insert_data,
			array( '%s', '%d', '%d' )
		);

return $wpdb->insert_id;
	}
}

if ( ! function_exists( 'learn_press_course_insert_section_item' ) ) {
	function learn_press_course_insert_section_item( $item_data = array() ) {
		global $wpdb;

$wpdb->insert(
			$wpdb->learnpress_section_items,
			array(
				'section_id' => $item_data['section_id'],
				'item_id'    => $item_data['item_id'],
				'item_order' => $item_data['item_order'],
				'item_type'  => $item_data['item_type'],
			),
			array(
				'%d',
				'%d',
				'%d',
				'%s',
			)
		);

return $wpdb->insert_id;
	}
}

if ( ! function_exists( 'learn_press_duplicate_post' ) ) {
	/**
	 * Duplicate post.
	 *
	 * @param null  $post_id
	 * @param array $args
	 * @param bool  $meta
	 *
	 * @return bool|mixed
	 * @since 3.0.0
	 */
	function learn_press_duplicate_post( $post_id = null, $args = array(), $meta = true ) {
		$post = get_post( $post_id );

if ( ! $post ) {
			return false;
		}

$default = array(
			'comment_status' => $post->comment_status,
			'ping_status'    => $post->ping_status,
			'post_author'    => get_current_user_id(),
			'post_content'   => $post->post_content,
			'post_excerpt'   => $post->post_excerpt,
			'post_parent'    => $post->post_parent,
			'post_password'  => $post->post_password,
			'post_status'    => 'draft',
			'post_title'     => $post->post_title . __( 'Copy', 'learnpress' ),
			'post_type'      => $post->post_type,
			'to_ping'        => $post->to_ping,
			'menu_order'     => $post->menu_order,
			'exclude_meta'   => array(),
		);

$args         = wp_parse_args( $args, $default );
		$exclude_meta = array();

if ( ! empty( $args['exclude_meta'] ) ) {
			$exclude_meta = $args['exclude_meta'];
			unset( $args['exclude_meta'] );
		}

$new_post_id = wp_insert_post( $args );

if ( ! is_wp_error( $new_post_id ) && $meta ) {
			learn_press_duplicate_post_meta( $post_id, $new_post_id, $exclude_meta );

$taxonomies = get_object_taxonomies( $post->post_type );

foreach ( $taxonomies as $taxonomy ) {
				$post_terms = wp_get_object_terms( $post_id, $taxonomy, array( 'fields' => 'slugs' ) );
				wp_set_object_terms( $new_post_id, $post_terms, $taxonomy, false );
			}
		}

return apply_filters( 'learn_press_duplicate_post', $new_post_id, $post_id );
	}
}

/**
 * Duplicate post meta.
 *
 * @editor tungnx
 * @sicne 3.0.0
 * @version 4.0.1
 */
if ( ! function_exists( 'learn_press_duplicate_post_meta' ) ) {
	function learn_press_duplicate_post_meta( $old_post_id, $new_post_id, $excerpt = array() ) {
		$lp_db = LP_Database::getInstance();

try {
			$excerpt           = array_merge( array( '_edit_lock', '_edit_last' ), $excerpt );
			$excerpt_name_keys = implode( "','", $excerpt );
			$sql_query         = $lp_db->wpdb->prepare(
				"INSERT INTO $lp_db->tb_postmeta (post_id, meta_key, meta_value)
				SELECT %d, pmc.meta_key, pmc.meta_value
				FROM $lp_db->tb_postmeta AS pmc
				WHERE post_id = %d
				AND meta_key not in ('{$excerpt_name_keys}')
				",
				$new_post_id,
				$old_post_id
			);

$lp_db->check_execute_has_error();

$lp_db->wpdb->query( $sql_query );
		} catch ( Throwable $e ) {
			error_log( $e->getMessage() );
		}
	}
}

if ( ! function_exists( 'learn_press_sort_questions' ) ) {
	function learn_press_sort_questions( $types ) {
		$user_id        = get_current_user_id();
		$question_types = get_user_meta( $user_id, '_learn_press_memorize_question_types', true );

if ( ! empty( $question_types ) ) {
			$sort = array();
			arsort( $types );
			$new_types = array();
			$ktypes    = array_keys( $types );

for ( $i = 0; $i < count( $ktypes ) - 1; $i ++ ) {
				$max = $i;

if ( ! isset( $question_types[ $ktypes[ $i ] ] ) ) {
					$question_types[ $ktypes[ $i ] ] = 0;
				}

for ( $j = $i + 1; $j < count( $ktypes ); $j ++ ) {
					if ( isset( $question_types[ $ktypes[ $j ] ], $question_types[ $ktypes[ $max ] ] )
						 && $question_types[ $ktypes[ $j ] ] > $question_types[ $ktypes[ $max ] ]
					) {
						$max = $j;
					}
				}

$tmp            = $ktypes[ $i ];
				$ktypes[ $i ]   = $ktypes[ $max ];
				$ktypes[ $max ] = $tmp;
			}

$ktypes = array_flip( $ktypes );
			$types  = array_merge( $ktypes, $types );
		}

return $types;
	}
}

if ( ! function_exists( 'learn_press_duplicate_question' ) ) {
	function learn_press_duplicate_question( $question_id = null, $quiz_id = null, $args = array() ) {
		if ( ! $question_id || ! get_post( $question_id ) ) {
			return new WP_Error( sprintf( __( 'Question id %s does not exist.', 'learnpress' ), $question_id ) );
		}

if ( $quiz_id && ! get_post( $quiz_id ) ) {
			return new WP_Error( sprintf( __( 'Quiz id %s does not exist.', 'learnpress' ), $quiz_id ) );
		}

global $wpdb;
		$new_question_id = learn_press_duplicate_post( $question_id, $args );

if ( $quiz_id ) {
			$sql = $wpdb->prepare(
				"
                SELECT * FROM $wpdb->learnpress_quiz_questions WHERE quiz_id = %d AND question_id = %d
                    ",
				$quiz_id,
				$question_id
			);

$quiz_question_data = $wpdb->get_row( $sql );
			$max_order          = $wpdb->get_var(
				$wpdb->prepare(
					"SELECT max(question_order) FROM {$wpdb->prefix}learnpress_quiz_questions WHERE quiz_id = %d",
					$quiz_id
				)
			);

if ( $quiz_question_data ) {
				$wpdb->insert(
					$wpdb->learnpress_quiz_questions,
					array(
						'quiz_id'        => $quiz_id,
						'question_id'    => $new_question_id,
						'question_order' => $max_order + 1,
						'params'         => $quiz_question_data->params,
					),
					array(
						'%d',
						'%d',
						'%d',
						'%s',
					)
				);
			}
		}

$sql = $wpdb->prepare(
			"
                    SELECT * FROM $wpdb->learnpress_question_answers WHERE question_id = %d
                ",
			$question_id
		);

$question_answers = $wpdb->get_results( $sql );

if ( $question_answers ) {
			foreach ( $question_answers as $q_a ) {
				$wpdb->insert(
					$wpdb->learnpress_question_answers,
					array(
						'question_id' => $new_question_id,
						'title'       => $q_a->title,
						'value'       => $q_a->value,
						'is_true'     => $q_a->is_true,
						'order'       => $q_a->order,
					),
					array(
						'%d',
						'%s',
						'%s',
					)
				);
			}
		}

return $new_question_id;
	}
}

if ( ! function_exists( 'learn_press_duplicate_quiz' ) ) {

function learn_press_duplicate_quiz( $quiz_id = null, $args = array() ) {
		global $wpdb;

$new_quiz_id = learn_press_duplicate_post( $quiz_id, $args, true );
		$quiz        = LP_Quiz::get_quiz( $quiz_id );
		if ( ! $quiz ) {
			return 0;
		}

$questions = $quiz->get_question_ids();

if ( $questions ) {
			foreach ( $questions as $question_id ) {
				$new_question_id = learn_press_duplicate_post( $question_id );

$sql = $wpdb->prepare(
					"
                    SELECT * FROM $wpdb->learnpress_quiz_questions WHERE quiz_id = %d AND question_id = %d
                        ",
					$quiz_id,
					$question_id
				);

$quiz_question_data = $wpdb->get_row( $sql );

if ( $quiz_question_data ) {
					$wpdb->insert(
						$wpdb->learnpress_quiz_questions,
						array(
							'quiz_id'        => $new_quiz_id,
							'question_id'    => $new_question_id,
							'question_order' => $quiz_question_data->question_order,
							'params'         => $quiz_question_data->params,
						),
						array(
							'%d',
							'%d',
							'%d',
							'%s',
						)
					);
				}

$sql = $wpdb->prepare(
					"
                            SELECT * FROM $wpdb->learnpress_question_answers WHERE question_id = %d
                        ",
					$question_id
				);

$question_answers = $wpdb->get_results( $sql );
				if ( $question_answers ) {
					foreach ( $question_answers as $q_a ) {
						$wpdb->insert(
							$wpdb->learnpress_question_answers,
							array(
								'question_id' => $new_question_id,
								'title'       => $q_a->title,
								'value'       => $q_a->value,
								'is_true'     => $q_a->is_true,
								'order'       => $q_a->order,
							),
							array(
								'%d',
								'%s',
								'%s',
							)
						);
					}
				}
			}
		}

return $new_quiz_id;
	}
}

/**
 * Get general data to render in chart
 *
 * @param null  $from
 * @param null  $by
 * @param float $time_ago
 *
 * @return array
 */
function learn_press_get_chart_general( $from = null, $by = null, $time_ago = 0 ) {
	global $wpdb;

$labels   = array();
	$datasets = array();

if ( is_null( $from ) ) {
		$from = current_time( 'mysql', 1 );
	}

if ( is_null( $by ) ) {
		$by = 'days';
	}

$results = array(
		'all'     => array(),
		'public'  => array(),
		'pending' => array(),
		'free'    => array(),
		'paid'    => array(),
	);

$results = array(
		'course'  => array(),
		'lesson'  => array(),
		'quiz'    => array(),
		'student' => array(),
		'teacher' => array(),
		'revenue' => array(),
	);

$from_time   = is_numeric( $from ) ? $from : strtotime( $from );
	$_from       = '';
	$_to         = '';
	$_sql_format = '';
	$date_format = '';

case 'months':
			$date_format = 'M Y';
			$_from       = - $time_ago + 1;
			$_from       = date( 'Y-m-01', strtotime( "{$_from} {$by}", $from_time ) );
			$days        = date( 't', mktime( 0, 0, 0, date( 'm', $from_time ), 1, date( 'Y', $from_time ) ) );
			$_to         = date( 'Y-m-' . $days, $from_time );
			$_sql_format = '%Y-%m';
			$_key_format = 'Y-m';
			break;

case 'years':
			$date_format = 'Y';
			$_from       = - $time_ago + 1;
			$_from       = date( 'Y-01-01', strtotime( "{$_from} {$by}", $from_time ) );
			$days        = date( 't', mktime( 0, 0, 0, date( 'm', $from_time ), 1, date( 'Y', $from_time ) ) );
			$_to         = date( 'Y-12-' . $days, $from_time );
			$_sql_format = '%Y';
			$_key_format = 'Y';
			break;

}

$query_where = '';
	if ( current_user_can( LP_TEACHER_ROLE ) ) {
		$user_id      = learn_press_get_current_user_id();
		$query_where .= $wpdb->prepare( ' AND c.post_author=%d ', $user_id );
	}

if ( $_results = $wpdb->get_results( $query ) ) {
		foreach ( $_results as $k => $v ) {
			$results['all'][ $v->d ] = $v;
		}
	}

$query = $wpdb->prepare(
		"
				SELECT count(c.ID) as c, DATE_FORMAT( c.post_date, %s) as d
				FROM {$wpdb->posts} c
				WHERE 1
				{$query_where}
				AND c.post_status = %s AND c.post_type = %s
				GROUP BY d
				HAVING d BETWEEN %s AND %s
				ORDER BY d ASC
			",
		$_sql_format,
		'publish',
		'lp_course',
		$_from,
		$_to
	);

if ( $_results = $wpdb->get_results( $query ) ) {
		foreach ( $_results as $k => $v ) {
			$results['publish'][ $v->d ] = $v;
		}
	}

$query = $wpdb->prepare(
		"
				SELECT count(c.ID) as c, DATE_FORMAT( c.post_date, %s) as d
				FROM {$wpdb->posts} c
				INNER JOIN {$wpdb->postmeta} cm ON cm.post_id = c.ID
				WHERE 1
				{$query_where}
				AND c.post_status = %s AND c.post_type = %s
				GROUP BY d
				HAVING d BETWEEN %s AND %s
				ORDER BY d ASC
			",
		$_sql_format,
		'publish',
		'lp_course',
		$_from,
		$_to
	);

if ( $_results = $wpdb->get_results( $query ) ) {
		foreach ( $_results as $k => $v ) {
			$results['paid'][ $v->d ] = $v;
		}
	}

for ( $i = - $time_ago + 1; $i <= 0; $i ++ ) {
		$date     = strtotime( "$i $by", $from_time );
		$labels[] = date( $date_format, $date );
		$key      = date( $_key_format, $date );

$datasets[0]['data'][] = $all;
		$datasets[1]['data'][] = $publish;
		$datasets[2]['data'][] = $all - $publish;
		$datasets[3]['data'][] = $paid;
		$datasets[4]['data'][] = $all - $paid;
	}

return array(
		'labels'   => $labels,
		'datasets' => $datasets,
		'sql'      => $query,
	);
}

function learn_press_get_default_section( $section = null ) {
	if ( ! $section ) {
		$section = new stdClass();
	}
	foreach (
		array(
			'section_id'          => null,
			'section_name'        => '',
			'section_course_id'   => null,
			'section_order'       => null,
			'section_description' => '',
		) as $k => $v
	) {
		if ( ! property_exists( $section, $k ) ) {
			$section->{$k} = $v;
		}
	}

return $section;
}

/**
 * Display time fields for a post in editing mode.
 *
 * @param int $edit
 * @param int $for_post
 * @param int $tab_index
 * @param int $multi
 */
function learn_press_touch_time( $edit = 1, $for_post = 1, $tab_index = 0, $multi = 0 ) {
	global $wp_locale;
	$post = get_post();

if ( $for_post ) {
		$edit = ! ( in_array(
			$post->post_status,
			array(
				'draft',
				'pending',
			)
		) && ( ! $post->post_date_gmt || '0000-00-00 00:00:00' == $post->post_date_gmt ) );
	}

$tab_index_attribute = '';
	if ( (int) $tab_index > 0 ) {
		$tab_index_attribute = " tabindex=\"$tab_index\"";
	}

$time_adj  = current_time( 'timestamp' );
	$post_date = ( $for_post ) ? $post->post_date : get_comment()->comment_date;
	$jj        = ( $edit ) ? mysql2date( 'd', $post_date, false ) : gmdate( 'd', $time_adj );
	$mm        = ( $edit ) ? mysql2date( 'm', $post_date, false ) : gmdate( 'm', $time_adj );
	$aa        = ( $edit ) ? mysql2date( 'Y', $post_date, false ) : gmdate( 'Y', $time_adj );
	$hh        = ( $edit ) ? mysql2date( 'H', $post_date, false ) : gmdate( 'H', $time_adj );
	$mn        = ( $edit ) ? mysql2date( 'i', $post_date, false ) : gmdate( 'i', $time_adj );
	$ss        = ( $edit ) ? mysql2date( 's', $post_date, false ) : gmdate( 's', $time_adj );

$cur_jj = gmdate( 'd', $time_adj );
	$cur_mm = gmdate( 'm', $time_adj );
	$cur_aa = gmdate( 'Y', $time_adj );
	$cur_hh = gmdate( 'H', $time_adj );
	$cur_mn = gmdate( 'i', $time_adj );

$map = array(
		'mm' => array( $mm, $cur_mm ),
		'jj' => array( $jj, $cur_jj ),
		'aa' => array( $aa, $cur_aa ),
		'hh' => array( $hh, $cur_hh ),
		'mn' => array( $mn, $cur_mn ),
	);

foreach ( $map as $timeunit => $value ) {
		list( $unit, $curr ) = $value;

echo '<input type="hidden" id="hidden_' . $timeunit . '" name="hidden_' . $timeunit . '" value="' . $unit . '" />' . "\n";
		$cur_timeunit = 'cur_' . $timeunit;
		echo '<input type="hidden" id="' . $cur_timeunit . '" name="' . $cur_timeunit . '" value="' . $curr . '" />' . "\n";
	}
}

/**
 * Return id of current screen.
 *
 * @return bool|string
 * @since 3.2.6
 */
function learn_press_get_screen_id() {
	_deprecated_function( __METHOD__, '4.2.3.6' );
	$screen    = get_current_screen();
	$screen_id = $screen ? $screen->id : false;

return $screen_id;
}

require_once 'class-lp-post-type-actions.php';