3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $x=array(1=>'t'); var_dump(key($x)); var_dump((object)$x); var_dump(key((array)(object)$x));
Output for 5.1.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(1) object(stdClass)#1 (1) { [1]=> string(1) "t" } int(1)
Output for 4.3.2 - 4.4.0, 4.4.2 - 5.0.5
Fatal error: Only variables can be passed by reference in /in/MBZnN on line 6
Process exited with code 255.
Output for 4.4.1
int(1) object(stdClass)(1) { [1]=> string(1) "t" } int(1)
Output for 4.3.0 - 4.3.1
Fatal error: Only variables can be passed by reference in /in/MBZnN on line 6