run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(dirname('/abc/acs')); var_dump(dirname('/abc')); var_dump(dirname('/')); var_dump(dirname('abc/acs')); var_dump(dirname('abc')); var_dump(dirname(''));

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).
Note: hhvm uses a JIT which only kicks in after a few runs. Since we run scripts only once, hhvm always runs slower.

VersionSystem time (s)User time (s)Memory (MiB)