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<?php $id = 'hierarchical_select'; print preg_replace('/(^|_|\.)+(.)/', function ($match) { return ('.' === $match[1] ? '_' : '').strtoupper($match[2]); }, $id);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: preg_replace(): Argument #2 ($replacement) must be of type array|string, Closure given in /in/F2ffV:3 Stack trace: #0 /in/F2ffV(3): preg_replace('/(^|_|\\.)+(.)/', Object(Closure), 'hierarchical_se...') #1 {main} thrown in /in/F2ffV on line 3
Process exited with code 255.

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