Simple helper function to convert camelCase <=> snakeCase

StringCaseUtils.php

<?php
class StringCaseUtils
{

    public static function toSnakeCase($camelCase)
    {
        return strtolower(preg_replace('/([A-Z])/', '_$1', lcfirst($camelCase)));
    }

    public static function toCamelCase($snakeCase)
    {
        return implode('', array_map('ucfirst', explode("_", $snakeCase)));
    }
}