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@ 2014-03-25T08:50:14Z

<?php

echo strtolower(preg_replace("/(?!^)(?=[A-Z])/", "_", "FooBar"));

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)
strtolower: documentation ( source)

preferences:dark modelive preview

38.3 ms | 402 KiB | 5 Q