Source

File: wp-includes/class-wp-editor.php

public static function wp_link_query( $args = array() ) {
		$pts      = get_post_types( array( 'public' => true ), 'objects' );
		$pt_names = array_keys( $pts );

		$query = array(
			'post_type'              => $pt_names,
			'suppress_filters'       => true,
			'update_post_term_cache' => false,
			'update_post_meta_cache' => false,
			'post_status'            => 'publish',
			'posts_per_page'         => 20,
		);

		$args['pagenum'] = isset( $args['pagenum'] ) ? absint( $args['pagenum'] ) : 1;

		if ( isset( $args['s'] ) ) {
			$query['s'] = $args['s'];
		}

		$query['offset'] = $args['pagenum'] > 1 ? $query['posts_per_page'] * ( $args['pagenum'] - 1 ) : 0;

		/**
		 * Filters the link query arguments.
		 *
		 * Allows modification of the link query arguments before querying.
		 *
		 * @see WP_Query for a full list of arguments
		 *
		 * @since 3.7.0
		 *
		 * @param array $query An array of WP_Query arguments.
		 */
		$query = apply_filters( 'wp_link_query_args', $query );

		// Do main query.
		$get_posts = new WP_Query;
		$posts     = $get_posts->query( $query );

		// Build results.
		$results = array();
		foreach ( $posts as $post ) {
			if ( 'post' === $post->post_type ) {
				$info = mysql2date( __( 'Y/m/d' ), $post->post_date );
			} else {
				$info = $pts[ $post->post_type ]->labels->singular_name;
			}

			$results[] = array(
				'ID'        => $post->ID,
				'title'     => trim( esc_html( strip_tags( get_the_title( $post ) ) ) ),
				'permalink' => get_permalink( $post->ID ),
				'info'      => $info,
			);
		}

		/**
		 * Filters the link query results.
		 *
		 * Allows modification of the returned link query results.
		 *
		 * @since 3.7.0
		 *
		 * @see 'wp_link_query_args' filter
		 *
		 * @param array $results {
		 *     An array of associative arrays of query results.
		 *
		 *     @type array ...$0 {
		 *         @type int    $ID        Post ID.
		 *         @type string $title     The trimmed, escaped post title.
		 *         @type string $permalink Post permalink.
		 *         @type string $info      A 'Y/m/d'-formatted date for 'post' post type,
		 *                                 the 'singular_name' post type label otherwise.
		 *     }
		 * }
		 * @param array $query  An array of WP_Query arguments.
		 */
		$results = apply_filters( 'wp_link_query', $results, $query );

		return ! empty( $results ) ? $results : false;
	}