Ticket #15049: meta.php.diff

wp-includes/meta.php

@@ -52 +52 @@
 
         $_meta_value = $meta_value;
         $meta_value = maybe_serialize( stripslashes_deep($meta_value) );
-
+    
+    if ( $wpdb->get_var( $wpdb->prepare(
+                "SELECT COUNT(*) FROM $table WHERE meta_key = %s AND $column = %d AND meta_value = %s",
+                $meta_key, $object_id, $meta_value ) ) )
+                return false;
+    
         $wpdb->insert( $table, array(
                 $column => $object_id,
                 'meta_key' => $meta_key,