Question

我遇到了这个登录脚本的问题（开源btw）。出于某种原因，我收到以下错误：注意你在哪里看到“---”我已经删除了某些东西！如果有人帮助我，我将不胜感激：）

Notice: Use of undefined constant dfengineid - assumed 'dfengineid' in C:\xampp\htdocs\---\resources\login.php on line 113

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\---\index.php:217) in C:\xampp\htdocs\dfengine.com\resources\login.php on line 113

Notice: Use of undefined constant dfenginekey - assumed 'dfenginekey' in C:\xampp\htdocs\---\resources\login.php on line 115

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\---\index.php:217) in C:\xampp\htdocs\dfengine.com\resources\login.php on line 115

Warning: Cannot modify header information - headers already sent by (output started at C:\xampp\htdocs\---\index.php:217) in C:\xampp\htdocs\dfengine.com\resources\login.php on line 121

 <?php 

// Connects to your Database 

 mysql_connect("localhost", "root", "---") or die(mysql_error()); 
 mysql_select_db("dfeuserdb") or die(mysql_error()); 

 //This code runs if the form has been submitted
 //Checks if there is a login cookie
 if(isset($_COOKIE['dfengineid']))
 //if there is, it logs you in and directes you to the members page
 { 
    $username = $_COOKIE['dfengineid']; 
    $pass = $_COOKIE['dfenginekey'];
    $check = mysql_query("SELECT * FROM users WHERE username = '$username'")or die(mysql_error());

    while($info = mysql_fetch_array( $check ))  
    {
        if ($pass != $info['password']) {}
        else
        {
            header("Location: search.php");
        }
    }
 }

 //if the login form is submitted     
 if (isset($_POST['submit'])) { // if form has been submitted

    // makes sure they filled it in  
    if(!$_POST['username'] | !$_POST['pass']) {    
        die('You did not fill in a required field.');
    }

    // checks it against the database
    $check = mysql_query("SELECT * FROM users WHERE username = '".$_POST['username']."'")or die(mysql_error());

    //Gives error if user dosen't exist
    $check2 = mysql_num_rows($check);
    if ($check2 == 0) {
        die('Username or Password is incorrect! Please <a href="index.php">try again</a>.');
    }

    while($info = mysql_fetch_array( $check )){
        $_POST['pass'] = stripslashes($_POST['pass']);
        $info['password'] = stripslashes($info['password']);
        $_POST['pass'] = md5($_POST['pass']);

    //gives error if the password is wrong

        if ($_POST['pass'] != $info['password']) {
            die('Username or Password is incorrect! Please <a href="index.php">try again</a>.');
        }
        else { 
            // if login is ok then we add a cookie 
            $_POST['username'] = stripslashes($_POST['username']); 
            $hour = time() + 3600; 
            setcookie(dfengineid, $_POST['username'], $hour); 
            setcookie(dfenginekey, $_POST['pass'], $hour);   
            //then redirect them to the members area 
            header("Location: members.php"); 
        } 
    } 
} 
else {   
 // if they are not logged in 
 ?> 

 <form action="<?php echo $_SERVER['PHP_SELF']?>" method="post"> 
 <table border="0"> 
 <tr><td>Username:</td><td> 
 <input type="text" name="username" maxlength="40"> 
 </td></tr> 
 <tr><td>Password:</td><td> 
 <input type="password" name="pass" maxlength="50"> 
 </td></tr>    
 <tr><td colspan="2" align="right"> 
 <input type="submit" name="submit" value="Login"> 
 </td></tr> 
 </table> 
 </form> 

 <?php } ?>

注意：问题已解决我将代码放在错误的位置，因此出现了所有这些错误。

Answer 1

setcookie(dfengineid, $_POST['username'], $hour);
setcookie(dfenginekey, $_POST['pass'], $hour);

应该是

setcookie('dfengineid', $_POST['username'], $hour);
setcookie('dfenginekey', $_POST['pass'], $hour);

Answer 2

setcookie(dfengineid, $_POST['username'], $hour); 

setcookie(dfenginekey, $_POST['pass'], $hour);

你在这里使用dfenginekey作为常量，我认为你的意思是这样做：

setcookie('dfengineid', $_POST['username'], $hour); 

setcookie('dfenginekey', $_POST['pass'], $hour);

我编辑了你的代码，现在应该工作了！

<?php
// Connects to your Database 

mysql_connect("localhost", "root", "---") or die(mysql_error());
mysql_select_db("dfeuserdb") or die(mysql_error());

//This code runs if the form has been submitted
//Checks if there is a login cookie
if (isset($_COOKIE['dfengineid']))
//if there is, it logs you in and directes you to the members page
{
    $username = $_COOKIE['dfengineid'];
    $pass = $_COOKIE['dfenginekey'];
    $check = mysql_query("SELECT * FROM users WHERE username = '". mysql_real_escape_string($username)."'") or die(mysql_error());

    while ($info = mysql_fetch_array($check))
    {
        if ($pass != $info['password'])
        {

        }
        else
        {
            die('<META HTTP-EQUIV=Refresh CONTENT="0; URL=search.php">');
        }
    }
}

//if the login form is submitted     
if (isset($_POST['submit']))
{ // if form has been submitted
    // makes sure they filled it in  
    if (!$_POST['username'] | !$_POST['pass'])
    {
        die('You did not fill in a required field.');
    }

    // checks it against the database
    $check = mysql_query("SELECT * FROM users WHERE username = '" . $_POST['username'] . "'") or die(mysql_error());

    //Gives error if user dosen't exist
    $check2 = mysql_num_rows($check);
    if ($check2 == 0)
    {
        die('Username or Password is incorrect! Please <a href="index.php">try again</a>.');
    }

    while ($info = mysql_fetch_array($check))
    {
        $_POST['pass'] = stripslashes($_POST['pass']);
        $info['password'] = stripslashes($info['password']);
        $_POST['pass'] = md5($_POST['pass']);

        //gives error if the password is wrong

        if ($_POST['pass'] != $info['password'])
        {
            die('Username or Password is incorrect! Please <a href="index.php">try again</a>.');
        }
        else
        {
            // if login is ok then we add a cookie 
            $_POST['username'] = stripslashes($_POST['username']);
            $hour = time() + 3600;
            setcookie('dfengineid', $_POST['username'], $hour);
            setcookie('dfenginekey', $_POST['pass'], $hour);
            //then redirect them to the members area 
            die( '<META HTTP-EQUIV=Refresh CONTENT="0; URL=members.php">');
        }
    }
}
else
{
    // if they are not logged in 
    ?> 

    <form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="post"> 
        <table border="0"> 
            <tr><td>Username:</td><td> 
                    <input type="text" name="username" maxlength="40"> 
                </td></tr> 
            <tr><td>Password:</td><td> 
                    <input type="password" name="pass" maxlength="50"> 
                </td></tr>    
            <tr><td colspan="2" align="right"> 
                    <input type="submit" name="submit" value="Login"> 
                </td></tr> 
        </table> 
    </form> 

<?php } ?>

Answer 3

从

更改以下行

setcookie(dfengineid, $_POST['username'], $hour);

setcookie(dfenginekey, $_POST['pass'], $hour);

到

setcookie('dfengineid', $_POST['username'], $hour);

setcookie('dfenginekey', $_POST['pass'], $hour);

Answer 4

第一

setcookie('dfengineid', $_POST['username'], $hour);

而不是

setcookie(dfengineid, $_POST['username'], $hour);

seccond：由于您在header之前输出了无法重定向的信息，因此可以解决错误或使用ob_start()

Answer 5

 setcookie('dfengineid', $_POST['username'], $hour); 
 setcookie('dfenginekey', $_POST['pass'], $hour);

在没有qoutes的情况下使用此代码会给您带来错误由于输出此错误而导致的下一个错误

注意：使用未定义的常量

5 个答案: