未定义的索引错误:编解码器为什么它给出错误没有改变发生在数据库中 - Undefined index error : codec why its giving error nothing changes happen in database

Undefined index error : codec why its giving error nothing changes happen in database

有人能向我解释一下我在哪里做错了请，如果我使用error_reporting其显示没有错误，但没有发生在我的数据库

<?php
 //error_reporting(E_ERROR | E_PARSE);
 include ("db.php");
$codec=$_POST['code'];
 if(isset($_POST['code']) && !empty($_POST['code']))
 {
     $search = mysql_query("SELECT code,active FROM users WHERE code='".$codec."'  AND active='0'") or die(mysql_error()); 
     $match  = mysql_num_rows($search);
     if($match > 0)
     {
         mysql_query("UPDATE users SET active='1' WHERE code='".$codec."' AND active='0'") or die(mysql_error());
         echo '<div class="statusmsg">Your account has been activated, you can now login</div>';
     } 
     else
     {
         // No match -> invalid url or account has already been activated.
         echo '<div class="statusmsg">The url is either invalid or you already have activated your account.</div>';
     }
 }
?>

你在这里遇到这个问题…

if(!isset($_POST['code']) && !empty($_POST['code']))

if(isset($_POST['code']) && !empty($_POST['code']))

在下面输入12345实际上会返回12345，因此您可以以此为基础。

<?php
$codec=$_POST['code'];
 if(isset($_POST['submit'])){
    if(isset($_POST['code']) && !empty($_POST['code']))
    {
echo "Code :" .$codec;
    }
}
?>
<form action="" method="post">
Code: 
<input type="text" name="code">
<br>
<input type="submit" name="submit" value="Submit">
</form>