<?php echo preg_replace_callback('/([a-z])(_[a-z])/', function($u) { var_dump($u); return $u[1].ucwords(str_replace('_', '', $u[2])); } , 'rob_tr_yuui'); echo PHP_EOL; echo preg_replace('/([a-z])(_[a-z])/', '$1$2', 'rob_tr_yuui');
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