3v4l.org

run code in 300+ PHP versions simultaneously
<?php $message = 'hello world'; $result = join('', array_map( function ($word) { return ucfirst(strrev($word)); }, explode('', $message) ) ); if ($result === null) {print 'yes'} else {print 'no';};
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.24
Parse error: syntax error, unexpected '}' in /in/9V5eY on line 12
Process exited with code 255.

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