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<?php echo preg_replace('/(_[a-z])/g', function($u) { return str_replace('', '_', strtoupper($u)); } , 'robOtr');
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: preg_replace(): Argument #2 ($replacement) must be of type array|string, Closure given in /in/pumZu:6 Stack trace: #0 /in/pumZu(6): preg_replace('/(_[a-z])/g', Object(Closure), 'robOtr') #1 {main} thrown in /in/pumZu on line 6
Process exited with code 255.

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