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@ 2014-11-12T00:53:04Z

<?php
echo strtolower(preg_replace('/((?<=[a-z])(?=[A-Z]))/', '_', 'AbcDefGhijk'));

Output
Performance
VLD
References
Branches

strtolower: documentation ( source)

preferences:dark modelive previewkey bindings

75.86 ms | 2296 KiB | 5 Q