class-wp-editor.php

<?php
/**
 * Filter the link query arguments.
 *
 * Allows modification of the link query arguments before querying.
 *
 * @since 3.7.0
 *
 * @param array $query {
 *     An array of query arguments.
 * 
 *     @type string 'post_type'              The post type.
 *     @type bool   'suppress_filters'       Whether to suppress filters.
 *     @type bool   'update_post_term_cache' Whether to update the post term cache.
 *     @type bool   'update_post_meta_cache' Whether to update the post meta cache.
 *     @type string 'post_status'            The post status.
 *     @type string 'order'                  How to order the query, ascending or descending.
 *     @type string 'orderby'                What field to order the query by.
 *     @type int    'posts_per_page'         The number of posts to query for.
 * }
 */
$query = apply_filters( 'wp_link_query_args', $query );

// Do main query.
$get_posts = new WP_Query;
$posts = $get_posts->query( $query );
// Check if any posts were found.
if ( ! $get_posts->post_count )
	return false;

// 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,
	);
}

/**
 * Filter the link query results.
 *
 * Allows modification of the returned link query results.
 *
 * @since 3.7.0
 *
 * @param array $results {
 *     @type int    'ID'        The post id.
 *     @type string 'title'     The post title.
 *     @type string 'permalink' The 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 query arguments @see 'wp_link_query_args' filter.
 * }
 */
return apply_filters( 'wp_link_query', $results, $query );