src/FACTFinder/Core/ParametersConverter.php
protected function applyParameterMappings($parameters, $mappingRules)
    {
        foreach ($mappingRules as $k => $v)
        {
            if ($k != $v && isset($parameters[$k]))
            {
                $parameters[$v] = $parameters[$k];
                unset($parameters[$k]);
            }
        }
    }
protected function applyParameterMappings($parameters, $mappingRules)
    {
        foreach ($mappingRules as $k => $v)
        {
            if ($k != $v && isset($parameters[$k]))
            {
                $parameters[$v] = $parameters[$k];
                unset($parameters[$k]);
            }
        }
    }
Changes the keys in a Parameters object according to the given mapping
rules.
@param Parameters $parameters Parameters to be modified.
@param string[] $mappingRules Associative array of mapping rules.
Parameter names will be mapped from keys to values of this array.