Question

所以我有一个注册表格，其中包含用户名和密码输入，但无法成功添加电子邮件输入。该页面什么都不做。

有人可以解释我做错了什么以及如何纠正代码？非常感谢它。这是我的PHP代码（包括我尝试添加电子邮件输入）：

<?php

// Include config file
require_once 'config.php';

// Define variables and initialize with empty values
$username = $email = $password = $confirm_password = "";
$username_err = $email_err = $password_err = $confirm_password_err = "";

// Processing form data when form is submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {

    // Validate username
    if (empty(trim($_POST["username"]))) {
        $username_err = "Please enter a username.";
    } else {
        // Prepare a select statement
        $sql = "SELECT id FROM users WHERE username = ?";

        if ($stmt = mysqli_prepare($link, $sql)) {
            // Bind variables to the prepared statement as parameters
            mysqli_stmt_bind_param($stmt, "s", $param_username);

            // Set parameters
            $param_username = trim($_POST["username"]);

            // Attempt to execute the prepared statement
            if (mysqli_stmt_execute($stmt)) {
                /* store result */
                mysqli_stmt_store_result($stmt);

                if (mysqli_stmt_num_rows($stmt) == 1) {
                    $username_err = "This username is already taken.";
                } else {
                    $username = trim($_POST["username"]);
                }
            } else {
                echo "Oops! Something went wrong. Please try again later.";
            }
        }

        // Close statement
        mysqli_stmt_close($stmt);
    }
    // Validate email
    if (empty(trim($_POST["email"]))) {
        $email_err = "Please enter an email address.";
    } else {
        // Prepare a select statement
        $sql = "SELECT id FROM users WHERE email = ?";

        if ($stmt = mysqli_prepare($link, $sql)) {
            // Bind variables to the prepared statement as parameters
            mysqli_stmt_bind_param($stmt, "s", $param_email);

            // Set parameters
            $param_email = trim($_POST["email"]);

            // Attempt to execute the prepared statement
            if (mysqli_stmt_execute($stmt)) {
                /* store result */
                mysqli_stmt_store_result($stmt);

                if (mysqli_stmt_num_rows($stmt) == 1) {
                    $email_err = "This email is already used.";
                } else {
                    $email = trim($_POST["email"]);
                }
            } else {
                echo "Oops! Something went wrong. Please try again later.";
            }
        }

        // Close statement
        mysqli_stmt_close($stmt);
    }

    // Validate password
    if (empty(trim($_POST['password']))) {
        $password_err = "Please enter a password.";
    } elseif (strlen(trim($_POST['password'])) < 6) {
        $password_err = "Password must have atleast 6 characters.";
    } else {
        $password = trim($_POST['password']);
    }

    // Validate confirm password
    if (empty(trim($_POST["confirm_password"]))) {
        $confirm_password_err = 'Please confirm password.';
    } else {
        $confirm_password = trim($_POST['confirm_password']);
        if ($password != $confirm_password) {
            $confirm_password_err = 'Password did not match.';
        }
    }

    // Check input errors before inserting in database
    if (empty($username_err) && empty($username_err) && empty($password_err) && empty($confirm_password_err)) {

        // Prepare an insert statement
        $sql = "INSERT INTO users (email, username, password) VALUES (?, ?)";

        if ($stmt = mysqli_prepare($link, $sql)) {
            // Bind variables to the prepared statement as parameters
            mysqli_stmt_bind_param($stmt, "ss", $param_email, $param_username, $param_password);

            // Set parameters
            $param_username = $username;
            $param_email = $email;
            $param_password = password_hash($password, PASSWORD_DEFAULT); // Creates a password hash
            // Attempt to execute the prepared statement
            if (mysqli_stmt_execute($stmt)) {
                // Redirect to login page
                header("location: login.php");
            } else {
                echo "Something went wrong. Please try again later.";
            }
        }

        // Close statement
        mysqli_stmt_close($stmt);
    }

    // Close connection
    mysqli_close($link);
}
?>

Answer 1

您需要添加3个占位符。您只添加了2个占位符

更正

// Prepare an insert statement
$sql = "INSERT INTO users (email, username, password) VALUES (?, ?,?)"; //add 3 placeholders    
mysqli_stmt_bind_param($stmt, "sss", $param_email, $param_username, $param_password); //you have 3strings here so add sss(3)

在PHP注册表中要求发送电子邮件

1 个答案: