3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function isMangled($key) { $arr = []; $arr[$key] = null; return (string) $key !== (string) key($arr); } var_dump( isMangled(1), isMangled(1.5), isMangled(null), isMangled("test"), isMangled("test\0") );
based on LCU0d
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(false) bool(true) bool(false) bool(false) bool(false)
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/MSBoB on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/MSBoB on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/MSBoB on line 4
Process exited with code 255.