3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $array = array( 'filters'=> array('where'=>array('yr'=>1994))); echo array_shift(array_keys($array['filters']['where']));
based on 2Ip20
Output for 7.0.0 - 7.1.0
Notice: Only variables should be passed by reference in /in/uBHQm on line 3 yr
Output for 4.3.0 - 5.0.4, hhvm-3.10.0 - 3.12.0
yr
Output for 5.1.0 - 5.6.28
Strict Standards: Only variables should be passed by reference in /in/uBHQm on line 3 yr
Output for 5.0.5
Fatal error: Only variables can be passed by reference in /in/uBHQm on line 3
Process exited with code 255.