src/PhpCodeFixer.php
protected static function callFunctionUsageChecker($checker, $functionName, array $callTokens)
    {
        require_once dirname(dirname(__FILE__)).'/data/'.$checker.'.php';
        $checker = __NAMESPACE__ . '\\' . $checker;
        $result = $checker($callTokens, $functionName);
        return $result;
    }
protected static function callFunctionUsageChecker($checker, $functionName, array $callTokens)
    {
        require_once dirname(dirname(__FILE__)).'/data/'.$checker.'.php';
        $checker = __NAMESPACE__ . '\\' . $checker;
        $result = $checker($callTokens, $functionName);
        return $result;
    }
Calls function-usage checker
@param string $checker
@param string $functionName
@param array $callTokens
@return boolean