解析错误：语法错误，第18行C:\xampp\htdocs\login\signup.php中的意外标识符“mysqli_query”

Question

在这段代码中，我收到“解析错误：语法错误，文件意外结束。 我不明白那是什么问题！任何人都可以解决这个问题。

<?php
    session_start();

    include("db.php");

    if($_SERVER['REQUEST_METHOD'] == 'POST'){

        $first_name = $_POST['fname'];
        $last_name = $_POST['lname'];
        $gender = $_POST['gender'];
        $num = $_POST['cnum'];
        $address = $_POST['address'];
        $gmail = $_POST['email'];
        $password = $_POST['pass'];

        if(!empty($gmail) && !empty($password) && !is_numeric($gmail)){
            $query = "insert into form (fname, lname, gender, cnum, address, email, pass) VALUES ('$first_name', '$last_name', '$gender', '$num', '$address', '$gmail', '$pass');"
            
            mysqli_query($con, $query);

            echo "<script type='text/javascript'> alert('Successfully Register') </script>";

        }
        else
        {
            echo "<script type='text/javascript'> alert('please enter valid information') </script>";
        }


    }