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run code in 150+ php & hhvm versions
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<?php echo preg_replace('/([a-z])(_[a-z])/', function($a) { var_dump($a) }, 'rob_tr_yuui');
Output for 5.3.0 - 5.4.23
Parse error: syntax error, unexpected '}' in /in/lmEZv on line 3
Process exited with code 255.