Ticket #36905: 36905.patch

src/wp-includes/post.php

@@ -4327 +4327 @@
 function get_page_by_title( $page_title, $output = OBJECT, $post_type = 'page' ) {
         global $wpdb;
 
+        $last_changed = wp_cache_get( 'last_changed', 'posts' );
+        if ( false === $last_changed ) {
+                $last_changed = microtime();
+                wp_cache_set( 'last_changed', $last_changed, 'posts' );
+        }
+
+        $hash      = md5( $page_title . serialize( $post_type ) );
+        $cache_key = "get_page_by_title:$hash:$last_changed";
+        $cached    = wp_cache_get( $cache_key, 'posts' );
+        if ( false !== $cached ) {
+                // Special case: '0' is a bad `$page_path`.
+                if ( '0' === $cached || 0 === $cached ) {
+                        return;
+                } else {
+                        return get_post( $cached, $output );
+                }
+        }
+
         if ( is_array( $post_type ) ) {
                 $post_type = esc_sql( $post_type );
                 $post_type_in_string = "'" . implode( "','", $post_type ) . "'";
@@ -4347 +4365 @@
 
         $page = $wpdb->get_var( $sql );
 
+        // We cache misses as well as hits.
+        wp_cache_set( $cache_key, $page, 'posts' );
+
         if ( $page ) {
                 return get_post( $page, $output );
         }