    public static function isExist($token){
        $json = Options::v('tokens');
        $tokens = json_decode($json, true);
        if(!is_array($tokens) || $tokens == ""){
            $tokens = array();
        }
        if(array_key_exists($token, $tokens)){
            $call = true;
        }else{
            $call = false;
        }
        return $call;
    }

The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.