wp_edit_posts_query function from wp-admin/includes/post.php line 849

post.php

<?php

/**
 * Run the wp query to fetch the posts for listing on the edit posts page
 *
 * @since 2.5.0
 *
 * @param array|bool $q Array of query variables to use to build the query or false to use $_GET superglobal.
 * @return array
 */
function wp_edit_posts_query( $q = false ) {
	if ( false === $q )
		$q = $_GET;
	$q['m'] = isset($q['m']) ? (int) $q['m'] : 0;
	$q['cat'] = isset($q['cat']) ? (int) $q['cat'] : 0;
	$post_stati  = get_post_stati();

	if ( isset($q['post_type']) && in_array( $q['post_type'], get_post_types() ) )
		$post_type = $q['post_type'];
	else
		$post_type = 'post';

	$avail_post_stati = get_available_post_statuses($post_type);

	if ( isset($q['post_status']) && in_array( $q['post_status'], $post_stati ) ) {
		$post_status = $q['post_status'];
		$perm = 'readable';
	}

	if ( isset($q['orderby']) )
		$orderby = $q['orderby'];
	elseif ( isset($q['post_status']) && in_array($q['post_status'], array('pending', 'draft')) )
		$orderby = 'modified';

	if ( isset($q['order']) )
		$order = $q['order'];
	elseif ( isset($q['post_status']) && 'pending' == $q['post_status'] )
		$order = 'ASC';

	$per_page = 'edit_' . $post_type . '_per_page';
	$posts_per_page = (int) get_user_option( $per_page );
	if ( empty( $posts_per_page ) || $posts_per_page < 1 )
		$posts_per_page = 20;

	$posts_per_page = apply_filters( $per_page, $posts_per_page );
	$posts_per_page = apply_filters( 'edit_posts_per_page', $posts_per_page, $post_type );

	$query = compact('post_type', 'post_status', 'perm', 'order', 'orderby', 'posts_per_page');

	// Hierarchical types require special args.
	if ( is_post_type_hierarchical( $post_type ) && !isset($orderby) ) {
		$query['orderby'] = 'menu_order title';
		$query['order'] = 'asc';
		$query['posts_per_page'] = -1;
		$query['posts_per_archive_page'] = -1;
	}

	if ( ! empty( $q['show_sticky'] ) )
		$query['post__in'] = (array) get_option( 'sticky_posts' );

	wp( $query );

	return $avail_post_stati;
}