无法从PHP中的mysql\u fetch\u array（）获取数据

这是我的PHP：这段代码做得很好

if(isset($_COOKIE["user"])) {
$username = $_COOKIE["user"]; 
$pass = $_COOKIE["password"];
$check = mysql_query("SELECT * FROM members WHERE email = '$username'")or die(mysql_error()); 
    while ($info = mysql_fetch_array( $check ))
        {
        //if the cookie is present but has the wrong password, they are  taken to the login page 
        if ($pass != $info['password']) 
        {
            header("Location: login.php"); 
            exit();
        }  
        else //if the cookie is present and doesn'T have the wrong password they are shown the admin area    
        { 
            include 'header.php';
        }
    }

}
else //if the cookie is present and doesn'T have the wrong password they are shown the admin area    
        {
            header("Location: login.php"); 
            exit();
        }   

但在同一页的后面，我尝试从$info变量访问数据，结果什么也没有出来。我知道我做错了什么，但不知道是什么

<?php print $info['name']?>

---

$info变量被本地化为if语句

将$info变量设为全局变量。

执行以下操作时： 当最后$info超出最后一条记录时，它为false不再有记录。因此$info为false，而循环终止，其中没有更多的数据库信息

作为一种解决方法，我们将第一个$info保存在$info0中， 在while循环之后使用$info0而不是$info

<?php echo $info0['name']; ?>

在while循环之后，使用以下函数：

$info = mysql_data_seek($check, 0) ? mysql_fetch_array($check) : null;

当然，.

如果你想在ifisset$\u COOKIE[user]{中使用$info是可以的，但是如果你想在ifisset$\u COOKIE[user]{之外使用$info，将会有一个问题，因为在ifisset$\u COOKIE[user]{之前没有初始化$info，所以你的代码是这样的

$username = $_COOKIE["user"]; 
$pass = $_COOKIE["password"];

if(isset($_COOKIE["user"])) {
$check = mysql_query("SELECT * FROM members WHERE email = '$username'")or die(mysql_error()); 
    while ($info = mysql_fetch_array( $check ))
        {
        //if the cookie is present but has the wrong password, they are  taken to the login page 
        if ($pass != $info['password']) 
        {
            header("Location: login.php"); 
            exit();
        }  
        else //if the cookie is present and doesn'T have the wrong password they are shown the admin area    
        { 
            include 'header.php';
        }
    }

}
else //if the cookie is present and doesn'T have the wrong password they are shown the admin area    
        {
            header("Location: login.php"); 
            exit();
        }   


$check = mysql_query("SELECT * FROM members WHERE email = '$username'")or die(mysql_error()); 
$info = mysql_fetch_array( $check );

---

您的输出或日志文件中是否有任何警告/错误？不再支持mysql_*函数，它们已不再维护，将来将不再支持。您应该使用或更新代码，以确保将来项目的功能。如果我将变量设为全局变量，如何使用它？$check=mysql\u querySELECT*来自email='$username'或diemsql\u error；$info=mysql\u fetch\u array$check；而$info{}您实际上可以在while语句中设置一个新变量，并将$info['name']设置为与之相等。$name=然后在while语句中：$name=$info['name']

<?php echo $info0['name']; ?>

$info = mysql_data_seek($check, 0) ? mysql_fetch_array($check) : null;

$username = $_COOKIE["user"]; 
$pass = $_COOKIE["password"];

if(isset($_COOKIE["user"])) {
$check = mysql_query("SELECT * FROM members WHERE email = '$username'")or die(mysql_error()); 
    while ($info = mysql_fetch_array( $check ))
        {
        //if the cookie is present but has the wrong password, they are  taken to the login page 
        if ($pass != $info['password']) 
        {
            header("Location: login.php"); 
            exit();
        }  
        else //if the cookie is present and doesn'T have the wrong password they are shown the admin area    
        { 
            include 'header.php';
        }
    }

}
else //if the cookie is present and doesn'T have the wrong password they are shown the admin area    
        {
            header("Location: login.php"); 
            exit();
        }   


$check = mysql_query("SELECT * FROM members WHERE email = '$username'")or die(mysql_error()); 
$info = mysql_fetch_array( $check );