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run code in 300+ PHP versions simultaneously
<?php $callable = function(&$foo) { $foo = 42; } $bar = 23; $callable(23); var_dump($bar);
Output for 5.5.24 - 5.5.30, 5.6.8 - 5.6.16, 7.0.0
Parse error: syntax error, unexpected '$bar' (T_VARIABLE) in /in/ZpsXo on line 7
Process exited with code 255.

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