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PHP、MySQl 查询未运行

转载 作者：行者123 更新时间：2023-11-29 17:49:33 25 4
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出现此错误。请任何人帮忙。我是这方面的初学者。

Undefined variable: mysqli in C:\xampp\htdocs\final\register.php on line 20
Fatal error: Uncaught Error: Call to a member function prepare() on null in C:\xampp\htdocs\final\register.php:20 Stack trace: #0 {main}
thrown in C:\xampp\htdocs\final\register.php on line 20

我们需要做什么才能通过一些验证来验证 html 表单，以及如何将提交的详细信息放入数据库表中？

这是代码

注册.php 

<?php
 include "header.php";
// Include config file
require_once 'dbconfig.php';

// Define variables and initialize with empty values
$username = $password = $confirm_password = "";
$username_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 signup WHERE username = ?";

    if($stmt = $mysqli->prepare($conn,$sql)){
        // Bind variables to the prepared statement as parameters
        $stmt->bind_param("s", $param_username);

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

        // Attempt to execute the prepared statement
        if($stmt->execute()){
            // store result
            $stmt->store_result();

            if($stmt->num_rows == 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
    $stmt->close();
}

// 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($username_err) && empty($password_err) && empty($confirm_password_err)){

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

    if($stmt = $mysqli->prepare($sql)){
        // Bind variables to the prepared statement as parameters
        $stmt->bind_param("ss", $param_username, $param_password);

        // Set parameters
        $param_username = $username;
        $param_password = password_hash($password, PASSWORD_DEFAULT); // Creates a password hash

        // Attempt to execute the prepared statement
        if($stmt->execute()){
            // Redirect to login page
            header("location: login.php");
        } else{
            echo "Something went wrong. Please try again later.";
        }
    }

    // Close statement
    $stmt->close();
}

// Close connection
$mysqli->close();
}
?>

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Sign Up</title>
<link rel="stylesheet" 
href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.css">
<style type="text/css">
    body{ font: 14px sans-serif; }
    .wrapper{ 
        width: 350px;
        padding: 20px;
       margin: 10px 10px 10px 10px; 
         }
</style>
</head>
<body>
<div class="jumbotron">
 <div class="wrapper">
    <h2>Sign Up</h2>
    <p>Please fill this form to create an account.</p>
    <form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
        <div class="form-group <?php echo (!empty($username_err)) ? 'has-error' : ''; ?>">
            <label>Username</label>
            <input type="text" name="username"class="form-control" value="<?php echo $username; ?>">
            <span class="help-block"><?php echo $username_err; ?></span>
        </div>    
        <div class="form-group <?php echo (!empty($password_err)) ? 'has-error' : ''; ?>">
            <label>Password</label>
            <input type="password" name="password" class="form-control" value="<?php echo $password; ?>">
            <span class="help-block"><?php echo $password_err; ?></span>
        </div>
        <div class="form-group <?php echo (!empty($confirm_password_err)) ? 'has-error' : ''; ?>">
            <label>Confirm Password</label>
            <input type="password" name="confirm_password" class="form-control" value="<?php echo $confirm_password; ?>">
            <span class="help-block"><?php echo $confirm_password_err; ?></span>
        </div>
        <div class="form-group">
            <input type="submit" class="btn btn-primary" value="Submit">
            <input type="reset" class="btn btn-default" value="Reset">
        </div>
        <p>Already have an account? <a href="login.php">Login here</a>.</p>
    </form>
</div>    
</div>

</body>
</html>


if($stmt = mysqli_prepare($conn, $sql)){}

该行显示错误。什么是绑定(bind)以及如何使用它？

登录.php

<?php
include 'header.php';
// Include config file
require_once 'dbconfig.php';

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

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

// Check if username is empty
if(empty(trim($_POST["username"]))){
    $username_err = 'Please enter username.';
} else{
    $username = trim($_POST["username"]);
}

// Check if password is empty
if(empty(trim($_POST['password']))){
    $password_err = 'Please enter your password.';
} else{
    $password = trim($_POST['password']);
}

// Validate credentials
if(empty($username_err) && empty($password_err)){
    // Prepare a select statement
    $sql = "SELECT Username, Password FROM login WHERE Username = ?";

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

        // Set parameters
        $param_username = $username;

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

            // Check if username exists, if yes then verify password
            if(mysqli_stmt_num_rows($stmt) == 1){                    
                // Bind result variables
                mysqli_stmt_bind_result($stmt, $username, $hashed_password);
                if(mysqli_stmt_fetch($stmt)){
                    if(password_verify($password, $hashed_password)){
                        /* Password is correct, so start a new session and
                        save the username to the session */
                        session_start();
                        $_SESSION['username'] = $username;      
                        header("location: welcome.php");
                    } else{
                        // Display an error message if password is not valid
                        $password_err = 'The password you entered was not valid.';
                    }
                }
            } else{
                // Display an error message if username doesn't exist
                $username_err = 'No account found with that username.';
            }
        } else{
            echo "Oops! Something went wrong. Please try again later.";
        }
    }

    // Close statement
    mysqli_stmt_close($stmt);
}

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

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Login</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.css">
<style type="text/css">
    body{ font: 14px sans-serif; }
    .wrapper{ width: 350px; padding: 20px; }
</style>
</head>
<body>
<div class="wrapper">
    <h2>Login</h2>
    <p>Please fill in your credentials to login.</p>
    <form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
        <div class="form-group <?php echo (!empty($username_err)) ? 'has-error' : ''; ?>">
            <label>Username</label>
            <input type="text" name="username"class="form-control" value="<?php echo $username; ?>">
            <span class="help-block"><?php echo $username_err; ?></span>
        </div>    
        <div class="form-group <?php echo (!empty($password_err)) ? 'has-error' : ''; ?>">
            <label>Password</label>
            <input type="password" name="password" class="form-control">
            <span class="help-block"><?php echo $password_err; ?></span>
        </div>
        <div class="form-group">
            <input type="submit" class="btn btn-primary" value="Login">
        </div>
        <p>Don't have an account? <a href="register.php">Sign up now</a>.</p>
    </form>
</div>    
</body>
</html>

register_val.php

<?php

require_once('dbconfig.php');

// function for email validation
function is_valid_email($email)
{
 if (empty($email)) {
     echo "Email is required.";
     return false;
 } else {
     $email = test_input($email);
     // check if e-mail address is well-formed
     if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
       echo "Invalid email format."; 
       return false;
 } 
 // now check if the mail is already registered
 $slquery = "SELECT 2 FROM signup WHERE Email = '$email'";
 $selectresult = mysql_query($slquery);
 if(mysql_num_rows($selectresult)>0) {
   echo 'This email already exists.';
   return false;
 }
 // now returns the true- means you can proceed with this mail
 return true;
}

// function for password verification
function is_valid_passwords($password,$confirm_password) 
{
 // Your validation code.
 if (empty($password)) {
     echo "Password is required.";
     return false;
 } 
 else if ($password != $confirm_password) {
     // error matching passwords
     echo 'Your passwords do not match. Please type carefully.';
     return false;
 }
 // passwords match
 return true;
}

// function for creating user
function create_user($email, $password, $confirm_passwordpassword) 
{
  $query = "INSERT INTO `singup` (email, password, confirmpassword) VALUES ('$email', '$password', '$cpassword')";
  $result = mysql_query($query);
  if($result){
      return true; // Success
  }else{
      return false; // Error somewhere
  }
}

// Code execution starts here when submit
if (isset($_POST['email']) && isset($_POST['password'])){

// Reading form values
$email = $_POST['email'];
$password = $_POST['password'];
$confirm_password = $_POST['confirmpassword'];

if (is_valid_email($email) && is_valid_passwords($password,$confirm_password))
{
    if (create_user($email, $password, $cpassword)) {
          echo 'New User Registered Successfully.';
    }else{
      echo 'Error Registering User!';
    }
}
// You don't need to write another 'else' since this is the end of PHP code 
?>

dbconfig.php

<?php
$servername = "localhost";
$username = "root";
$password = "";

try {
$conn = new PDO("mysql:host=$servername; dbname = 'car sale' ", $username, $password);
// set the PDO error mode to exception
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    }
catch(PDOException $e)
{
echo "Connection failed: " . $e->getMessage();
}
?>

最佳答案

你创建了对象$mysqli吗？

$mysqli = new Mysqli("host","db user","db password","db name");

在调用$mysqli之前将其放在Register.php上

关于PHP、MySQl 查询未运行，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/49503471/

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