Query: Force author__not_in values to be integers

Props peterwilsoncc, westonruter, xknown, joehoyle, sergeybiryukov, jorbin, johnbillion, desrosj.

git-svn-id: https://develop.svn.wordpress.org/trunk@62771 602fd350-edb4-49c9-b593-d223f7449a82

Author: desrosj

src/wp-includes/class-wp-query.php

@@ -2407,12 +2407,16 @@ public function get_posts() {
 		}
 
 		if ( ! empty( $query_vars['author__not_in'] ) ) {
-			if ( is_array( $query_vars['author__not_in'] ) ) {
-				$query_vars['author__not_in'] = array_unique( array_map( 'absint', $query_vars['author__not_in'] ) );
-				sort( $query_vars['author__not_in'] );
+			$author__not_in_id_list = wp_parse_id_list( $query_vars['author__not_in'] );
+			if ( count( $author__not_in_id_list ) > 0 ) {
+				sort( $author__not_in_id_list );
+				$where .= sprintf(
+					" AND {$wpdb->posts}.post_author NOT IN (%s) ",
+					implode( ',', $author__not_in_id_list )
+				);
+				/** Update the query var for stable cache key generation in {@see self::generate_cache_key()}. */
+				$query_vars['author__not_in'] = $author__not_in_id_list;
 			}
-			$author__not_in = implode( ',', (array) $query_vars['author__not_in'] );
-			$where         .= " AND {$wpdb->posts}.post_author NOT IN ($author__not_in) ";
 		} elseif ( ! empty( $query_vars['author__in'] ) ) {
 			if ( is_array( $query_vars['author__in'] ) ) {
 				$query_vars['author__in'] = array_unique( array_map( 'absint', $query_vars['author__in'] ) );