Converting all underscore connected letters to uppercase in php

Question

I have a string like "kp_o_zmq_k" and I need to covert it to "kpOZmqK" where I need to convert all letters connected to the right of the underscore(o,z,k in this case) to uppercase.

Answer 1

Try with preg_replace_callback function in php.

$ptn = "/_[a-z]?/";
$str = "kp_o_zmq_k";
$result = preg_replace_callback($ptn,"callbackhandler",$str);
// print the result
echo $result;

function callbackhandler($matches) {
    return strtoupper(ltrim($matches[0], "_"));
}