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<?php echo preg_replace_callback('/_([a-z])/', function($a) { var_dump($a); return strtoupper($a[0])}, 'rob_tr_yuui');
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.23
Parse error: syntax error, unexpected '}' in /in/pffXK on line 3
Process exited with code 255.
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178.2 ms | 1395 KiB | 60 Q