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使用php更改密碼

[英]Change password using php

 原文  2018-01-02 19:48:55  1   1    php/ html/ mysql

問題描述

我正在嘗試在小型登錄應用程序上使用php更改密碼。 當我提交表單時，它可以正確無誤地進入登錄頁面，但是密碼沒有更改。 我沒有在代碼中看到任何錯誤。 不知道這是查詢錯誤還是變量綁定錯誤。 有任何想法嗎？ 

<?php
// Initialize variables
$password = $confirm_password = "";
$password_err = $confirm_password_err = "";

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

    // Validate password
    if(empty(trim($_POST['password']))){
        $password_err = "Please enter a password.";     
    } elseif(strlen(trim($_POST['password'])) < 6){
        $password_err = "Password must have at least 6 characters.";
    } elseif(!preg_match("#[0-9]+#", trim($_POST['password']))){
        $password_err = "Password must have at least 1 number.";
    } elseif(!preg_match("#[a-z]+#", trim($_POST['password']))){
        $password_err = "Password must have at least 1 lowercase character.";
    } elseif(!preg_match("#[A-Z]+#", trim($_POST['password']))){
        $password_err = "Password must have at least 1 uppercase character.";
    } else{
       $password = trim($_POST['password']);
    }

    // Validate password_confirm
    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.';
        }
    }

    if(empty($password_err) && empty($confirm_password_err)) {      
        // Prepare an update statement
        $sql = "UPDATE users SET password = ? WHERE username = ?";

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

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

            if(mysqli_stmt_execute($stmt)){
            } else {
                echo "Oops! Something went wrong. Please try again later.";                             
            }
        }
        // Close statement
        mysqli_stmt_close($stmt);
        // Close connection
        mysqli_close($link);    
        // Redirect to logout  
        header("location: logout.php");
    }
}
?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Change Password</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>Change Password</h2>
        <p>Please fill this form to change password.</p>
        <form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post" autocomplete="off">
            <div class="form-group <?php echo (!empty($password_err)) ? 'has-error' : ''; ?>">
                <label>New Password:<sup>*</sup></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:<sup>*</sup></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>
        </form>
    </div>    
</body>
</html>

這是我的login.php： 

<?php
// Include config file
require_once 'config.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 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 = $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, $hashed_password)){
                            /* Password is correct, so start a new session and
                            save the username to the session */
                        if($stmt = mysqli_prepare($link)){
                            mysqli_stmt_bind_param($stmt, "ss", $param_username);
                            $param_username = $username;
                            if(mysqli_stmt_execute($stmt)){

                            } else {
                                echo "Oops! Something went wrong. Please try again later.";                             
                            }
                        }
                        session_start();
                        $_SESSION['username'] = $username;      
                        header("location: welcome.php");
                    } else{
                        // Display an error message if password is not valid
                        $password_err = 'You have entered an invalid username or password.';
                    }
                }
            } else{
                // Display an error message if username doesn't exist
                $username_err = 'You have entered an invalid username or password.';
            }
        } 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($_SERVER["PHP_SELF"]); ?>" method="post" autocomplete="off">
        <div class="form-group <?php echo (!empty($username_err)) ? 'has-error' : ''; ?>">
            <label>Username:<sup>*</sup></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:<sup>*</sup></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="Submit">
        </div>
        <p>Don't have an account? <a href="register.php">Sign up now</a>.</p>
    </form>
</div>    
</body>
</html>

1 個解決方案

解決方案1
 3  2018-01-02 20:21:36

從來沒有聲明$username變量，所以...我不知道您從哪里獲取用戶名，但是無論在哪里，都應該使用它。

我得到...

我看到您希望將用戶名用作更新和其他所有操作的主鍵。 那很酷，不是我個人的做法，但這很好。 由於到目前為止我無法在您的代碼中看到要更新的用戶名，因此我猜您正在使用$_SESSION或$_COOKIE 。

無論哪種情況，您都應該利用這些信息來設置SQL查詢的變量。 否則它將完全為空，因此SQL查詢實際上將如下所示： 

UPDATE `users` SET `password` = '$2y&scfncekr3kj437hdw8e7' WHERE `username` = ''

那根本不會做任何事情。

建議

綁定參數之前，應先設置參數（變量）。 

// Set parameters (variables)
$param_password = password_hash($password, PASSWORD_DEFAULT); // Creates a password hash
$param_username = $username; // this should be empty so far... maybe $_SESSION['username'] ??

// Bind parameters to the prepared statement
mysqli_stmt_bind_param($stmt, "ss", $param_password, $param_username);

我並不是說順序是有問題的，因為從未設置$username的事實是事實，但這更容易閱讀。

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