3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $myarray['myuser-myform']['myfile']="test"; printf('%s',key($myarray[0])); ?>
Output for 7.0.0 - 7.2.6
Notice: Undefined offset: 0 in /in/smR9v on line 3 Warning: key() expects parameter 1 to be array, null given in /in/smR9v on line 3
Output for 5.3.0 - 5.6.22
Warning: key() expects parameter 1 to be array, null given in /in/smR9v on line 3
Output for 4.3.2 - 4.4.0, 4.4.2 - 5.2.17
Warning: key(): Passed variable is not an array or object in /in/smR9v on line 3
Output for 4.4.1
Notice: Undefined offset: 0 in /in/smR9v on line 3 Warning: key(): Passed variable is not an array or object in /in/smR9v on line 3
Output for 4.3.0 - 4.3.1
Warning: key() [http://www.php.net/function.key]: Passed variable is not an array or object in /in/smR9v on line 3