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@ 2014-10-13T08:44:52Z

<?php

$a = function($string)
    {
        return preg_replace_callback(
            '/_([a-z])/',
            function ($string) {
                return strtoupper($string[1]);
            },
            $string
        );
    };

echo $a('IT_Solutions_Urgency_to_Change');

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

36.76 ms | 402 KiB | 5 Q