code: function ( map, files ) {
              var arr = [];
  
              files.forEach( function ( file ) {
                arr.push( '\'' + file + '\'=>\'' + map[ file ] + '\'' );
              });
  
              var out = '<?php\n\n$files = [\n\t' + arr.join( ',\n\t' ) + '\n];\n';
  
              grunt.file.write( 'tmp/map.php', out );
              grunt.file.write( 'tmp/map.json', JSON.stringify( map ) );
            }
docs: refPathTransform : function ( ref ) { return 'x__' + ref; },