3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $bar = range(0, 5); $i = 0; var_dump(array_keys($foo[$i] = $bar[$i++])[0]);
based on Ivfdr
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: array_keys() expects parameter 1 to be array, integer given in /in/80dPM on line 5 NULL
Output for hhvm-3.10.0 - 3.12.0
Warning: array_keys() expects parameter 1 to be an array or collection in /in/80dPM on line 5 NULL
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/80dPM on line 5
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/80dPM on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/80dPM on line 5
Process exited with code 255.