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@ 2014-10-03T08:41:01Z

<?php

$key = 'valami_underscored_cucc';

echo preg_replace_callback(
			'/_(\w)/',
			function(array $matches) {
				return ucfirst($matches[1]);
			},
			$key);

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
ucfirst: documentation ( source)

preferences:dark modelive preview

91.32 ms | 402 KiB | 5 Q