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@ 2014-10-22T09:27:24Z

<?php

echo preg_replace_callback("#_([a-z])#",function($r){
 return strtoupper($r[0]);
},'abc_def_ghj');

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
strtoupper: documentation ( source)

preferences:dark modelive preview

40.06 ms | 402 KiB | 5 Q