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@ 2016-12-06T15:13:15Z

<?php


$oldValue = 'new_name_spacing';

$newValue = preg_replace_callback(
                    '/(_[a-z])/',
                    function ($match) {
                        return substr($match, 1, strlen($match));
                    },
                    $oldValue
                );
                
echo $newValue;

Output
Performance
VLD
References
Branches

substr: documentation ( source)
preg_replace_callback: documentation ( source)

preferences:dark modelive preview

56.37 ms | 402 KiB | 5 Q