3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function foo($x) { return $x === $x(); } $a = function() { return true; }; $a = 'function(){return true;}'; echo foo($a);
based on Pkq0q
Output for 7.0.0 - 7.3.0rc3
Fatal error: Uncaught Error: Call to undefined function function(){return true;}() in /in/ffuH7:4 Stack trace: #0 /in/ffuH7(13): foo('function(){retu...') #1 {main} thrown in /in/ffuH7 on line 4
Process exited with code 255.
Output for hhvm-3.22.0
Fatal error: Uncaught Error: Call to undefined function function(){return true;}() in /in/ffuH7:-1 Stack trace: #0 /in/ffuH7(-1): foo() #1 {main}
Process exited with code 255.
Output for hhvm-3.18.5 - 3.21.3
Fatal error: Uncaught Error: Call to undefined function function(){return true;}() in /in/ffuH7:4 Stack trace: #0 /in/ffuH7(13): foo() #1 {main}
Process exited with code 255.
Output for 5.6.0 - 5.6.30
Fatal error: Call to undefined function function(){return true;}() in /in/ffuH7 on line 4
Process exited with code 255.