Ticket #22096: meta-value-empty-array.diff

wp-includes/meta.php

@@ -678 +678 @@
                 }
 
                 // WP_Query sets 'meta_value' = '' by default
-                if ( isset( $qv[ 'meta_value' ] ) && '' !== $qv[ 'meta_value' ] )
+                if ( isset( $qv[ 'meta_value' ] ) && '' !== $qv[ 'meta_value' ] && ( ! is_array( $qv[ 'meta_value' ] ) || $qv[ 'meta_value' ] ) )
                         $meta_query[0]['value'] = $qv[ 'meta_value' ];
 
                 if ( !empty( $qv['meta_query'] ) && is_array( $qv['meta_query'] ) ) {
@@ -714 +714 @@
                 $key_only_queries = array();
                 $queries = array();
 
+                // Split out the queries with empty arrays as value
+                foreach ( $this->queries as $k => $q ) {
+                        if ( is_array( $q['value'] ) && empty( $q['value'] ) ) {
+                                $key_only_queries[$k] = $q;
+                                unset( $this->queries[$k] );
+                        }
+                }               
+                
                 // Split out the meta_key only queries (we can only do this for OR)
                 if ( 'OR' == $this->relation ) {
                         foreach ( $this->queries as $k => $q ) {