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<?php echo preg_replace("#_([a-z])#",function($r){ return ucfirst($r); },'abc_def_ghj');
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/mj0ZJ:3 Stack trace: #0 /in/mj0ZJ(3): preg_replace('#_([a-z])#', Object(Closure), 'abc_def_ghj') #1 {main} thrown in /in/mj0ZJ on line 3
Process exited with code 255.

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