3v4l.org

run code in 300+ PHP versions simultaneously
<?php $b = function($a) use($b) { if ($a < 10) { $b($a+1); echo $a; } } $b(0);
Output for 5.5.24 - 5.5.30, 5.6.8 - 5.6.16, 7.0.0 - 7.0.1
Parse error: syntax error, unexpected '$b' (T_VARIABLE) in /in/7cNXf on line 10
Process exited with code 255.

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