Online PHP editor | refs for iAuOL

<?php var_dump([ $original_set = [ 'arrayobject' => new arrayobject( [3] ), 'reference?' => [5] ], $original_serialized = serialize( $original_set ), $original_unserialized = unserialize( $original_serialized ), $withreference_serialized = preg_replace( '/a:1:{i:0;i:5;}}/', 'R:4;}', $original_serialized ), $withreference_unserialized = unserialize( $withreference_serialized ), $withreference_unserialized['reference?'][9] = 8, $referenced_arrayobject = & $withreference_unserialized['arrayobject'], $reference_array = & $withreference_unserialized['reference?'], $withreference_unserialized, ( ( $referenced_arrayobject[9] ) === ( $reference_array[9] ) ) ? 'looks like a reference' : 'does not look like a reference' , ]) ;