Ticket #34479: 34479.0.patch

src/wp-admin/includes/class-wp-posts-list-table.php

@@ -137 +137 @@
          * @return string The value of 'orderby'.
          */
         protected function get_orderby() {
-                return strtolower( get_query_var( 'orderby' ) );
+                $orderby = get_query_var( 'orderby' );
+
+                if ( is_string( $orderby ) ){
+                        return strtolower( $orderby );
+                } else {
+                        $keys = array_keys( $orderby );
+                        // Checks if is a Numeric Array or Associative
+                        if ( $keys !== range( 0, count( $orderby ) - 1 ) ){
+                                return array_map( 'strtolower', $keys );
+                        } else {
+                                return array_map( 'strtolower', $orderby );
+                        }
+                }
         }
 
         /**
@@ -149 +161 @@
          * @return string The value of 'order'.
          */
         protected function get_order() {
-                return strtolower( get_query_var( 'order' ) );
+                $orderby = get_query_var( 'orderby' );
+                if ( is_string( $orderby ) ){
+                        return strtolower( get_query_var( 'order' ) );
+                } else {
+                        // Checks if is a Numeric Array or Associative
+                        if ( array_keys( $orderby ) !== range( 0, count( $orderby ) - 1 ) ){
+                                return array_map( 'strtolower', array_values( $orderby ) );
+                        } else {
+                                return strtolower( get_query_var( 'order' ) );
+                        }
+                }
         }
 
         /**