PHP登錄頁面重定向到其自身並且不登錄

Question

我正在嘗試制作一個簡單的PHP MySQL登錄頁​​面。 我一直在閱讀代碼，看不到我在做什么錯。 我正在使用剛剛在數據庫中查看過的電子郵件和密碼進行測試，因此我知道它存在。 當我單擊上一個表單上的Submit時，它會將我重定向到同一頁面，並且沒有登錄（我知道這是因為我的標頭在工作時會隨着$ _SESSION變量而變化；我知道這是因為我的注冊頁面有效，但是注冊后不登錄）。 也要注意，在注冊時他們輸入了自己的名字和姓氏，這就是為什么我將其包含在session_start的$ _SESSION變量中的原因。 這是代碼（首先是表單，然后是checklogin.php頁面）：

<!--THIS IS THE FORM FROM THE PAGE SIGN_IN.PHP-->
<form method="post" target="checklogin.php">
   <label for="email">EMAIL/USERNAME:</label>
   <input type="text" name="email" id="email">
   <label for="password">PASSWORD:</label>
   <input type="password" name="password" id="password">
   <br />
   <input type="submit" value="Let's Play!">
</form>

這是表單發布到的checklogin.php腳本：

<?php
$mysqli = mysqli_connect("mysql_name","login_id","password", "db_name");
if (!$mysqli)
  {
  die('Could not connect: ' . mysqli_error($mysqli));
  }

// username and password sent from form
//NEVER Remove the mysql_real_escape_string. Else there could be an Sql-Injection!
$email=$mysqli->real_escape_string($_POST['email']);
$password=$mysqli->real_escape_string($_POST['password']);

$sql="SELECT * FROM tbl_name WHERE email='$email' and password='$password'";
$result = $mysqli->query($sql);

if(is_object($result) && $result->num_rows == 1){
  // Register variables and redirect to file "profile.php"
  session_start();
  $_SESSION['firstname']=$_POST['firstname'];
  $_SESSION['lastname']=$_POST['lastname'];
  $_SESSION['email']=$_POST['email'];
  $_SESSION['password']=$_POST['password'];
  redirect('profile.php');
} else {
  echo "Wrong Username or Password";
}

?>

我也用header（'location：profile.php'）嘗試過，但是結果相同。

Answer 1

<form method="post" action="checklogin.php">

action屬性用於指定將表單發布到的URL。 而target屬性用於指定URL的加載位置。

如果缺少action屬性，則默認為當前URL，這就是提交表單時導航到同一頁面的原因。

Answer 2

Change Your Form As:

    <form method="post" action="checklogin.php">
       <label for="email">EMAIL/USERNAME:</label>
       <input type="text" name="email" id="email">
       <label for="password">PASSWORD:</label>
       <input type="password" name="password" id="password">
       <br />
       <input type="submit" value="Let's Play!">
    </form>

 Checklogin.php as

    <?php
    $mysqli = mysqli_connect("mysql_name","login_id","password", "db_name");
    if (!$mysqli)
      {
      die('Could not connect: ' . mysqli_error($mysqli));
      }

    // username and password sent from form
    //NEVER Remove the mysql_real_escape_string. Else there could be an Sql-Injection!
    $email=$mysqli->real_escape_string($_POST['email']);
    $password=$mysqli->real_escape_string($_POST['password']);

    $sql="SELECT * FROM tbl_name WHERE email='$email' and password='$password'";
    $result = $mysqli->query($sql);

    if(is_object($result) && $result->num_rows == 1){
      // Register variables and redirect to file "profile.php"
      session_start();
      $_SESSION['firstname']=$_POST['firstname'];
      $_SESSION['lastname']=$_POST['lastname'];
      $_SESSION['email']=$_POST['email'];
      $_SESSION['password']=$_POST['password'];
      //redirect('profile.php');
      header('location:profile.php');

} else {
  echo "Wrong Username or Password";
}

?>