wp_check_post_lock() WordPress Function

function wp_check_post_lock( $post_id ) {
	$post = get_post( $post_id );
	if ( ! $post ) {
		return false;
	}

	$lock = get_post_meta( $post->ID, '_edit_lock', true );
	if ( ! $lock ) {
		return false;
	}

	$lock = explode( ':', $lock );
	$time = $lock[0];
	$user = isset( $lock[1] ) ? $lock[1] : get_post_meta( $post->ID, '_edit_last', true );

	if ( ! get_userdata( $user ) ) {
		return false;
	}

	/** This filter is documented in wp-admin/includes/ajax-actions.php */
	$time_window = apply_filters( 'wp_check_post_lock_window', 150 );

	if ( $time && $time > time() - $time_window && get_current_user_id() != $user ) {
		return $user;
	}

	return false;
}
Uses	Description
wp-admin/includes/ajax-actions.php:wp_check_post_lock_window	Filters the post lock window duration.
wp-includes/pluggable.php:get_userdata()	Retrieve user info by user ID.
wp-includes/plugin.php:apply_filters()	Calls the callback functions that have been added to a filter hook.
wp-includes/user.php:get_current_user_id()	Gets the current user’s ID.
wp-includes/post.php:get_post_meta()	Retrieves a post meta field for the given post ID.
wp-includes/post.php:get_post()	Retrieves post data given a post ID or post object.
Used By	Description
wp-includes/class-wp-customize-manager.php:WP_Customize_Manager::check_changeset_lock_with_heartbeat()	Checks locked changeset with heartbeat API.
wp-includes/class-wp-customize-manager.php:WP_Customize_Manager::handle_changeset_trash_request()	Handles request to trash a changeset.
wp-includes/class-wp-customize-manager.php:WP_Customize_Manager::customize_pane_settings()	Prints JavaScript settings for parent window.
wp-admin/includes/class-wp-posts-list-table.php:WP_Posts_List_Table::column_title()	Handles the title column output.
wp-admin/includes/revision.php:wp_print_revision_templates()	Print JavaScript templates required for the revisions experience.
wp-admin/includes/misc.php:wp_check_locked_posts()	Checks lock status for posts displayed on the Posts screen.
wp-admin/includes/misc.php:wp_refresh_post_lock()	Checks lock status on the New/Edit Post screen and refresh the lock.
wp-admin/includes/post.php:_admin_notice_post_locked()	Outputs the HTML for the notice to say that someone else is editing or has taken over editing of this post.
wp-admin/includes/post.php:post_preview()	Saves a draft or manually autosaves for the purpose of showing a post preview.
wp-admin/includes/post.php:wp_autosave()	Saves a post submitted with XHR.
wp-admin/includes/post.php:bulk_edit_posts()	Processes the post data for the bulk editing of posts.
wp-admin/includes/ajax-actions.php:wp_ajax_inline_save()	Ajax handler for Quick Edit saving a post from a list table.
wp-admin/includes/class-wp-posts-list-table.php:WP_Posts_List_Table::single_row()
wp-includes/class-wp-customize-manager.php:WP_Customize_Manager::save()	Handles customize_save WP Ajax request to save/update a changeset.