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run code in 200+ php & hhvm versions
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<?php $string='direction-only'; echo preg_match_callback('/(\w*)-(\w*)/', function($match) { return implode('', array_map($match, function($string) { return ucfirst($string); })); }, $string);
based on 0nTf4
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught Error: Call to undefined function preg_match_callback() in /in/YQZQo:3 Stack trace: #0 {main} thrown in /in/YQZQo on line 3
Process exited with code 255.
Output for 5.3.17 - 5.6.28
Fatal error: Call to undefined function preg_match_callback() in /in/YQZQo on line 3
Process exited with code 255.