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<?php echo preg_replace_callback('/([a-z])([A-Z])/', '$1_$2', 'eOaUi'); echo preg_replace_callback('/([a-z])([A-Z])/', function (array $matches) { var_dump($matches); }, 'eOaUi');
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: preg_replace_callback(): Argument #2 ($callback) must be a valid callback, function "$1_$2" not found or invalid function name in /in/RAVFk:3 Stack trace: #0 /in/RAVFk(3): preg_replace_callback('/([a-z])([A-Z])...', '$1_$2', 'eOaUi') #1 {main} thrown in /in/RAVFk on line 3
Process exited with code 255.

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