3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $b = function($a) use($b) { if ($a < 10) { $b($a+1); echo $a; } }; $b(0);
based on 7cNXf
Output for 7.0.0 - 7.2.0
Notice: Undefined variable: b in /in/6aSaO on line 3 Fatal error: Uncaught Error: Function name must be a string in /in/6aSaO:5 Stack trace: #0 /in/6aSaO(10): {closure}(0) #1 {main} thrown in /in/6aSaO on line 5
Process exited with code 255.
Output for 5.3.20 - 5.6.28
Notice: Undefined variable: b in /in/6aSaO on line 3 Fatal error: Function name must be a string in /in/6aSaO on line 5
Process exited with code 255.