3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php call_user_func($a = function () use (&$a) {$a = debug_backtrace()[1]['function']; echo '.'; $a();});
Output for 7.0.0 - 7.1.0
Notice: Undefined offset: 1 in /in/eAGhI on line 2 . Fatal error: Uncaught Error: Function name must be a string in /in/eAGhI:2 Stack trace: #0 /in/eAGhI(2): {closure}() #1 {main} thrown in /in/eAGhI on line 2
Process exited with code 255.
Output for hhvm-3.12.0
Notice: Undefined index: 1 in /in/eAGhI on line 2 . Fatal error: Function name must be a string in /in/eAGhI on line 2
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.6.28
. Warning: call_user_func() expects at least 1 parameter, 0 given in /in/eAGhI on line 2
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/eAGhI on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/eAGhI on line 2
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 T_FUNCTION in /in/eAGhI on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/eAGhI on line 2
Process exited with code 255.