3v4l.org

run code in 300+ PHP versions simultaneously
<?php $camelCase = "USADollarSymbol"; echo strtolower( preg_replace( ["/([A-Z]+)/", "/_([A-Z]+)([A-Z][a-z])/"], ["_$1", "_$1_$2"], lcfirst($camelCase) ) );

preferences:
58.06 ms | 402 KiB | 5 Q