3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $string = "resource_id_heeelp_lala_klopsiki"; preg_match_all('/(_[\w]{1})/', $string, $matches); if(!empty($matches[0])){ foreach($matches[0] as $key){ $result = substr($key, 0, 1); //result is c $result1=str_replace($result,'',$key);//now your result1 is apitalize $result2=ucfirst($result1); //now result2 is Apitalize $finalresult=$result.$result2; ///now your finalresult is cApitalize preg_replace("/".$key."/", $finalresult, $string); } } print $string;
Output for 4.3.0 - 7.1.0
resource_id_heeelp_lala_klopsiki