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<?php echo preg_replace_callback("#_([a-z])#",function($r){ return ucfirst($r); },'abc_def_ghj');
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: ucfirst(): Argument #1 ($string) must be of type string, array given in /in/M2oDJ:4 Stack trace: #0 /in/M2oDJ(4): ucfirst(Array) #1 [internal function]: {closure}(Array) #2 /in/M2oDJ(3): preg_replace_callback('#_([a-z])#', Object(Closure), 'abc_def_ghj') #3 {main} thrown in /in/M2oDJ on line 4
Process exited with code 255.

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