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<?php echo preg_replace_callback('/(_[a-z])/', function($u) { return str_replace('', '_', strtoupper($u)); } , 'rob_tr');
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: strtoupper(): Argument #1 ($string) must be of type string, array given in /in/qZ0bN:12 Stack trace: #0 /in/qZ0bN(12): strtoupper(Array) #1 [internal function]: {closure}(Array) #2 /in/qZ0bN(6): preg_replace_callback('/(_[a-z])/', Object(Closure), 'rob_tr') #3 {main} thrown in /in/qZ0bN on line 12
Process exited with code 255.

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