未定義的索引錯誤，我該如何解決這個問題？

這是我的全編碼，未定義的索引錯誤，我該如何解決這個問題？

<?php

如果（isset（$ _ POST [ '提交']））{

$用戶名= $ _ POST [ '用戶名']; $ password = $ _POST ['password'];

if($username && $password){ 
      $insert = mysql_query("INSERT INTO users VALUES('', '$username', '$password')"); 

      $msg = "User is created successfully"; 
    } 
    else{ 
      $error = "Please fillup all required fields!"; 
    }

}出現 >

<form class="form-horizontal" action="settings_user.php" method="POST"> 

          <div class="form-group"><label class="col-lg-2 control-label">User Name</label> 

           <div class="col-lg-4"><input type="text" name="username" placeholder="" class="form-control" autofocus> 
           </div> 
          </div> 
          <div class="form-group"><label class="col-lg-2 control-label">Password</label> 

           <div class="col-lg-4"><input type="password" name="password" placeholder="" class="form-control"></div> 
          </div> 
          <div class="form-group"> 
           <div class="col-lg-offset-2 col-lg-10"> 
            <button class="btn btn-sm btn-primary" name="submit" type="submit">ADD</button> 
           </div> 
          </div> 
          <?php echo $msg; ?> 
          <?php echo $error; ?> 

        </form>

的兩個錯誤消息：？我該如何解決這個未定義指數$味精和$錯誤

？

來源

2014-09-25 Taufiqur Rahman

是的，它應該會出現，因爲變量$ msg和$ error只會在表單提交的時候被定義！ – 2014-09-25 04:16:01

這可能工作。「成功」和「失敗」不是使用2個變量，而是使用單個變量並相應地輸入消息。初始化全局變量。

<?php 
$msg=""; 
if(isset($_POST['submit'])) { 


$username = $_POST['username']; $password = $_POST['password']; 
if($username && $password){ 
$insert = mysql_query("INSERT INTO users VALUES('', '$username', '$password')"); 

$msg = "User is created successfully"; 
} 
else{ 
$msg = "Please fillup all required fields!"; 
} 
} 

?> 

<html> 
<body> 
<form class="form-horizontal" action="settings_user.php" method="POST"> 
<div class="form-group"><label class="col-lg-2 control-label">User Name</label> 
<div class="col-lg-4"><input type="text" name="username" placeholder="" class="form-control"   

autofocus> 
</div> 
</div> 
<div class="form-group"><label class="col-lg-2 control-label">Password</label> 
<div class="col-lg-4"><input type="password" name="password" placeholder="" class="form- 

control"></div> 
</div> 
<div class="form-group"> 
<div class="col-lg-offset-2 col-lg-10"> 
<button class="btn btn-sm btn-primary" name="submit" type="submit">ADD</button> 
</div> 
</div> 

<?php echo $msg; ?> 
</form> 
</body> 
</html>

來源

2014-09-25 04:27:08

未定義的索引錯誤，我該如何解決這個問題？

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