[英]I am trying to make a login page. However something keeps going wrong - and I don't know what?
我是 PHP 的新手,我一直在學習如何制作注冊/登錄頁面的課程。 我已成功完成注冊頁面,但登錄頁面給我帶來了問題。 這是我的登錄代碼。php:
<?php
include_once '../resources/session.php';
include_once '../resources/database.php';
include_once '../resources/utilities.php';
if(isset($_POST['loginBtn'])){
// array to hold errors
$form_errors = array();
// validate
$required_fields = array('username ', 'password ');
$form_errors = array_merge($form_errors, check_empty_fields($required_fields));
if(empty($form_errors)){
// collect form data
$user = $_POST['username'];
$password = $_POST['password'];
// check if user exists in the database
$sqlQuery = "SELECT * FROM users WHERE username = :username";
$statement = $db->prepare($sqlQuery);
$statement->execute(array(':username' => $user));
while($row = $statement->fetch()){
$id = $row['id'];
$hashedpassword = $row['password'];
$username = $row['username'];
if(password_verify($password, $hashed_password)){
$_SESSION['id'] = $id;
$_SESSION['username'] = $username;
header("location: dashboard.php");
}
else{
$result ="<p style='padding: 20px; color: red; border: 1px solid gray;'> Invalid username or password</p>";
}
}
}
else{
if(count($form_errors) == 1){
$result = "<p style='color:red;'>There was 1 error in the form</p>";
}
else{
$result = "<p style='color:red;'> There were " .count($form_errors). " errors in the form </p>";
}
}
}
?>
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title>Login</title>
<link rel="stylesheet" href="../css/indexstyles.css">
</head>
<body>
<h2>Login Form</h2>
<?php if(isset($result)) echo $result; ?>
<?php if(!empty($form_errors)) echo show_errors($form_errors); ?>
<form action="" method="post">
<table>
<tr>
<td>Username:</td>
<td><input type="text" value="" name="username "></td>
</tr>
<tr>
<td>Password:</td>
<td><input type="password" value="" name="password "></td>
</tr>
<tr>
<td></td>
<td><input style="float: right;" = type="submit" name="loginBtn" value="Login"></td>
</tr>
</table>
</form>
</html>
我的 database.php 代碼是:
<?php
// intialize variables to hold connection parameters
$username = 'root';
$dsn = 'mysql:host=localhost; dbname=register';
$password = 'xxxx';
try{
// create an instance of the PDO class with the required parameters
$db = new PDO($dsn, $username, $password);
// set PDO error mode to exception
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
// display success message
// echo "Connected to the register database";
}catch (PDOException $ex){
// display error message
echo "Connection unsuccesful. ERROR: ".$ex->getMessage();
}
我的實用程序代碼。php 是這樣的:
<?php
/**
* @param $required_fields_array, n array containing the list of all required fields
* @return array, containing all errors
*/
// start
function check_empty_fields($required_fields_array){
// initialize an array to store error messages
$form_errors = array();
// loop throgh the required fields array and popular the form error array
foreach ($required_fields_array as $name_of_field){
if(!isset($_POST[$name_of_field]) || $_POST[$name_of_field] == NULL){
$form_errors[] = $name_of_field . "is a required field";
}
}
return $form_errors;
}
/**
* @param $fields_to_check_length, an array containing the name of fields
* for which we wnt th check min required length e.g. array('username' => 4, 'email' => 12)
* @return array, containing all errors
*/
function check_min_length($fields_to_check_length){
//initialize an array to store error messages
$form_errors = array();
foreach($fields_to_check_length as $name_of_field => $minimum_length_required){
if(strlen(trim($_POST[$name_of_field])) < $minimum_lenth_required){
$form_errors[] = $name_of_field . " is too short, must be {$minimum_length_required} characters long";
}
}
return $form_errors;
}
/**
* @param $data, store a key/value pair array where key is the name of the form control
* in this case 'email' and value is the input entered by the user
* @return array, containing email error
*/
function check_email($data){
//initialize an array to store error messages
$form_errors + array();
$key = 'email';
// check if the key email exists in data array
if(array_key_exists($key, $data)){
// check if the email field has a value
if($_POST[$key] != null){
// remove all illegal characters from email
$key = filter_var($key, FILTER_SANITIZE_EMAIL);
// check if input is a valid email addresss
if(filter_var($_POST[$key], FILTER_VALIDATE_EMAIL) === false){
$form_errors[] = $key . " is not a valid email address";
}
}
}
return $form_errors;
}
/**
* @param $form_errors_array, the array holding all
* errors which we want to loop through
* @return string, list containing all error messages
*/
function show_errors($form_errors_array){
$errors = "<p><ul style ='color: red;'>";
// loop through error array and display all items in a list
foreach($form_errors_array as $the_error){
$errors .= "<li> {$the_error} </li>";
}
$errors .= "</ul><p>";
return $errors;
}
最后,我的 session.php 是:
<?php
session_start();
當我按下登錄按鈕而不輸入任何內容時,我會收到預期的錯誤消息。 但是,如果我輸入我創建的模擬賬戶,我仍然會收到相同的錯誤消息。
任何幫助是極大的贊賞!
一個
您根據需要檢查的字段末尾包含空格:
$required_fields = array('username ', 'password ');
因此,這些名稱永遠不會存在於發布的數據中。 將該行更改為:
$required_fields = array('username', 'password');
它應該工作。
更新:我之前沒有注意到,但您的表單輸入在名稱末尾也有空格。 也從那里刪除空間。 當表單提交並在末尾有這些空格時,$_POST 包含“用戶名_”和“密碼_”。 即 PHP 將空格轉換為下划線。
如果您添加空格只是為了讓錯誤消息有一個空格,那么添加空格的正確位置將就在“是必填字段”之前,而不是在輸入名稱本身中。
請記住在進行更改后重新加載頁面。
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