[Solved] Converting all underscore connected letters to uppercase in php [closed]

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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], "_"));
}

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solved Converting all underscore connected letters to uppercase in php [closed]