3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php function foo1(&$bar = 1) {} function foo2(&$bar = true) {} function foo3(&$bar = []) {} function foo4(&$bar = null) {} foo1($bar1); foo2($bar2); foo3($bar3); foo4($bar4); var_dump($bar1, $bar2, $bar3, $bar4);
Output for 5.4.0 - 7.1.0
NULL NULL NULL NULL
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/eCi24 on line 5
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/eCi24 on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected '=', expecting ')' in /in/eCi24 on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected '=', expecting ')' in /in/eCi24 on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/eCi24 on line 3
Process exited with code 255.