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public static function isFieldsEmpty($arrFields = array()) {        $traceList = debug_backtrace();        array_shift($traceList);        if (empty($traceList)) {            log("ERROR no caller. backtrace list:" . json_encode(debug_backtrace()));            return false;        }        $callTrace = $traceList[0];        $callRef = new ReflectionClass($callTrace['class']);        $method = $callRef->getMethod($callTrace['function']);        $objParams = $method->getParameters();        $arrInput = array();        foreach ($objParams as $i => $objParam) {            $arrInput[$objParam->name] = $callTrace['args'][$i];        }        $emptyFieldList = array();        foreach ($arrInput as $paramName => $paramValue) {            if (empty($arrFields) || in_array($paramName, $arrFields)) {                if (empty($paramValue)) {                    $emptyFieldList[] = $paramName;                }            }        }        if (empty($emptyFieldList)) {            return false;        } else {            $warningStr = "class " . $callTrace['class'] . " method" . $callTrace['method'] . " param error. fields:";            $warningStr .= json_encode($emptyFieldList);            log($warningStr);            return true;        }    }class A {    public static function getVal($a, $b, $c, $d) {        if (Kidtutor_Util_Valid::isFieldsEmpty(array('a'))) {            return false;        }    }}A::getVal(0, 0, 0, 1)

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