public function test() {
//        $str = 'if({who}+{her}>3,if({who}+{her}>3,{her},{her}+{abc}),{her}+{abc})+{her}-({abc}-{her})*{abc}';
        $param = $this->param;
        $str = $param['str'];
//        $str = "if(if({who}+{her}>{abc},{who},{whe})>=if({who}+{her}>3,{her}+5,{her}+{abc}),5,if({her}>3,2,1))+if({who}+{her}>3,if({who}+{her}>3,{her},{her}+{abc}),{her}+{abc})+{her}-({abc}-{her})*{abc}";
        //剔除空白符
        $str =  str_replace(' ', '', $str);
       // 错误情况，空字符串
        if ("" === $str) {
             return false;
        }
        //判断连续两个因子
        if(substr_count($str,'}{')) {
            return $this->resultError('不能将两个计算因子写在一起');
        }
        //判断是否所有因子都在因子集合范围内（替换后，查看是否还存在{）
        foreach ($this->items as $v){
            $items[] = $v['name'];
        }
        preg_match_all('/\{.*?\}/',$str,$out);
        for ($i = 0; $i < count($out[0]); $i++) {
            $item = $out[0][$i];
            if (!in_array($item,$items)) {
                return $this->resultError('计算因子不合法');
            }
        }
        //判断连续)(
        if(substr_count($str,')(')) {
            return $this->resultError('不能将两个计算因子写在一起');
        }
        //判断{}是否成对
        $stack = [];
        for ($i = 0; $i < strlen($str); $i++) {
            $item = $str[$i];
            if ('{' === $item) {
                array_push($stack,'(');
            } elseif ('}' === $item) {
                if (count($stack) > 0) {
                    array_pop($stack);
                } else {
                    return $this->resultError('计算因子不合法');
                }
            }
        }
        if (0 !== count($stack)) {
            return $this->resultError('计算因子不合法');
        }
        //判断()是否成对
        $stack = [];
        for ($i = 0; $i < strlen($str); $i++) {
            $item = $str[$i];
            if ('(' === $item) {
                array_push($stack,'(');
            } elseif (')' === $item) {
                if (count($stack) > 0) {
                    array_pop($stack);
                } else {
                    return $this->resultError('括号不配对');
                }
            }
        }
        if (0 !== count($stack)) {
            return $this->resultError('括号不配对');
        }
        //错误情况，运算符结尾
        if(preg_match('/[\x\÷\+\-\*\/]$/',$str)){
            return $this->resultError('不能以运算符结尾');
        }
        // 错误情况，(  后面是运算符
        if(preg_match('/\([\x\÷\*\/]/',$str)){
            return $this->resultError('左括号后面不能是运算符');
        }
        // 错误情况，)前面是运算符
        if(preg_match('/[\x\÷\+\-\*\/]\)/',$str)){
            return $this->resultError('右括号前面不能是运算符');
        }
        // 错误情况，运算符连续
        if(preg_match('/[\x\÷\+\-\*\/]{2,}/',$str)){
            return $this->resultError('运算符不能连续');
        }
        //空括号
        if(substr_count($str,'()')){
            return $this->resultError('括号中不能没有内容');
        }
        // 替换因子为随机的0.1-10
        foreach ($items as &$v){
            $str = str_replace($v,mt_rand(1,100)/10,$str);
        }

//        $str = 'if(4.7+2.1>3,if(4.7+2.1>3,2.1,2.1+6.2),2.1+6.2)+2.1-(6.2-2.1)*6.2';
//        $str = '5+if(3>2,if(5>4,4,if(9<6,5,6)),1)+2';
        $str = $this->getIf($str);
        $str = $this->why($str);
        $value = $this->cal($str);
        if(!$value){
            return $this->resultError('公式格式不正确');
        }
        if($value) {
            return $this->resultSucess($value);
        }
        else
            return $this->resultError($value);
            
    }
    public function why($str)
    {
        if(stripos($str,'if(') === false){
            return $str;
        }
        $str = substr($str,3,strlen($str)-4);
        $str = $this->getIf($str);
        return $this->why($str);
    }

    //递归把最里层的if算出结果
    private function getIf($str)
    {
        //获取if(第一次出现的位置
        $index = stripos($str,'if(');
        if($index === false){
            $subArr = explode(',',$str);
            preg_match('/(\<\=)|(\>\=)|(\!\=)|(\=)|(\<)|(\>)|(\&\&)|(\|\|)/',$subArr[0],$sign);
            if(empty($sign)){
                return $str;
            }
            $gt = explode($sign[0],$subArr[0]);
            if($sign[0] == '>')
                $str = "if(gt({$gt[0]},{$gt[1]}),{$subArr[1]},{$subArr[2]})";
            if($sign[0] == '<')
                $str = "if(lt({$gt[0]},{$gt[1]}),{$subArr[1]},{$subArr[2]})";
            if($sign[0] == '>=')
                $str = "if(egt({$gt[0]},{$gt[1]}),{$subArr[1]},{$subArr[2]})";
            if($sign[0] == '<=')
                $str = "if(elt({$gt[0]},{$gt[1]}),{$subArr[1]},{$subArr[2]})";
            if($sign[0] == '=')
                $str = "if(eq({$gt[0]},{$gt[1]}),{$subArr[1]},{$subArr[2]})";
            if($sign[0] == '!=')
                $str = "if(neq({$gt[0]},{$gt[1]}),{$subArr[1]},{$subArr[2]})";
            $value = $this->cal($str);
            return $value;
        }
        $strr = substr($str,$index+3);
        //找出if括号中的内容
//         echo $strr;die;
        $stack = [];
        for ($i = 0; $i < strlen($strr); $i++) {
            $item = $strr[$i];
            if ('(' === $item) {
                array_push($stack,'(');
            } elseif (')' === $item) {
                if (count($stack) > 0) {
                    array_pop($stack);
                } else {
                    //if右边括号在$strr中出现的位置
                    break;
                }
            }
        }
        $if = substr($strr,0,$i);
        return str_replace("if($if)",$this->getIf($if),"if($str)");
//
    }