--TEST-- MongoDB\BSON\Regex serialization with flags omitted --FILE-- <?php var_dump($regex = new MongoDB\BSON\Regex('regexp')); var_dump($s = serialize($regex)); var_dump(unserialize($s)); ?> ===DONE=== <?php exit(0); ?> --EXPECTF-- object(MongoDB\BSON\Regex)#%d (%d) { ["pattern"]=> string(6) "regexp" ["flags"]=> string(0) "" } string(83) "C:18:"MongoDB\BSON\Regex":52:{a:2:{s:7:"pattern";s:6:"regexp";s:5:"flags";s:0:"";}}" object(MongoDB\BSON\Regex)#%d (%d) { ["pattern"]=> string(6) "regexp" ["flags"]=> string(0) "" } ===DONE===