php - 将html表单数据发送到mysql数据库

Question

我很难通过php将html表单输入数据存储到mysql数据库中。当我填写表单并提交时，register.php页面为空，成功或错误消息都不会回显到页面上。
注意：是的，我有一个根密码和数据库名。这两个都是正确填写在我的代码我刚刚删除了他们为这篇文章。
编辑：分号已修复，仍有未知错误。
HTML表单：

<form action="register.php" method="POST">
                <input type="text" name="first_name" placeholder="first name" /><br /><br />
                <input type="text" name="last_name" placeholder="last name" /><br /><br />
                <input type="text" name="email" placeholder="email address" /><br /><br />
                <input type="text" name="password" placeholder="password" /><br /><br />
                <input type="submit" name="register" value="Sign Up" />
            </form>

单文件

<?php
if (isset($_POST['register'])) {
    $host = "localhost";
    $username = "root";
    $password = "";
    $database = "";
    $conn = mysqli_connect($host, $username, $password, $database);

    if (mysqli_connect_errno($conn)) {
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
    }

    $first_name = mysqli_real_escape_string($_POST['first_name']);
    $last_name = mysqli_real_escape_string($_POST['last_name']);
    $email = mysqli_real_escape_string($_POST['email']);
    $password = mysqli_real_escape_string($_POST['password']);
    $date = date("Y-m-d");

    $password = md5($password);

    $sql = "INSERT INTO users (first_name, last_name, email, password, sign_up_date) VALUES ('$first_name', '$last_name', '$email', '$password', '$date')";

    if (!mysqli_query($sql)) {
        die('Error: ' .mysqli_error());
    }

    echo "Entry added successfully";

    mysqli_close($conn); 
} 
?>

Answer 1

试试这个：

<?php
if (isset($_POST['register'])) {
    $host = "localhost";
    $username = "root";
    $password = "";
    $database = ""; //also added semi colon and what database name
    $conn = mysqli_connect($host, $username, $password, $database);

    if (mysqli_connect_errno($conn)) {
        echo "Failed to connect to MySQL: " . mysqli_connect_error();
    }

    $first_name = mysqli_real_escape_string($conn,$_POST['first_name']); //I've added $conn inside mysqli_real_escape_string expected 1st param
    $last_name = mysqli_real_escape_string($conn,$_POST['last_name']);
    $email = mysqli_real_escape_string($conn,$_POST['email']);
    $password = mysqli_real_escape_string($conn,$_POST['password']);
    $date = date("Y-m-d");

    $password = md5($password);

    $sql = "INSERT INTO users (first_name, last_name, email, password, sign_up_date) VALUES ('$first_name', '$last_name', '$email', '$password', '$date')";
    $query = mysqli_query($conn, $sql); // I think this will add data in your database.

    if (!$conn) { //I change this from mysql_query($sql)
        die('Error: ' .mysqli_error());
    } else {
       echo "Entry added successfully";

       mysqli_close($conn); 
    }
}