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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);
Output for git.master, git.master_jit, rfc.property-hooks
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.

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