3v4l.org

run code in 300+ PHP versions simultaneously
<?php $count = []; $callback = function ($i) use ($count) { $count[] = $i; }; for ($i = 0; $i < 4; $i++) { call_user_func($callback, $i); } var_dump($count):
Output for 5.4.0 - 5.4.34
Parse error: syntax error, unexpected ':' in /in/PW5ib on line 10
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/PW5ib on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/PW5ib on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/PW5ib on line 2
Process exited with code 255.
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215.66 ms | 1395 KiB | 124 Q