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run code in 150+ php & hhvm versions
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<?php $goal = 'g'; function g($str = null){ echo "pwat"; $g = $g($str = null){ echo "pwet"; }; return $g; } return g()()();
Output for 5.3.0 - 5.4.31
Parse error: syntax error, unexpected '{' in /in/YuKRL on line 7
Process exited with code 255.