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run code in 200+ php & hhvm versions
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<?php $a = 0; function f(&$arg) { :null $arg++; } var_dump(f($a)); ?>
based on 7oLpG
Output for 5.6.38 - 7.3.0rc3
Parse error: syntax error, unexpected ':' in /in/LfklG on line 5
Process exited with code 255.