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@ 2019-05-08T10:21:59Z

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

Output
Performance
VLD
References
Branches

lcfirst: documentation ( source)
strtolower: documentation ( source)

preferences:dark modelive previewkey bindings

44.67 ms | 1488 KiB | 5 Q