检查Cookie是否为空或设置在php中是否不起作用 - Checking if Cookie is empty or set in php not working?

Checking if Cookie is empty or set in php not working?

我有一些代码：

<?php
    $cookiename1 = "uservalue";
    $cookie1 = (string)$_COOKIE[$cookiename1];
    if($cookie1 != ""){
        echo "<span style = 'color: white'>". $cookie1 . "</span>";
    }
    else{
        die("Could not get profile");
    }
?>

它应该检测cookie是否为空，但当cookie等于"时，它会运行echo语句。

我最初有：

<?php
    $cookiename1 = "uservalue";
    $cookie1 = $_COOKIE[$cookiename1];
    if(isset($cookie1) && !empty($cookie1)){
        echo "<span style = 'color: white'>". $cookie1 . "</span>";
    }
    else{
        die("Could not get profile");
    }
?>

但我得到了同样的结果。不确定我在这里做错了什么//如果有人能帮忙，那就太棒了。

您需要使用setcookie（）

示例：

setcookie("uservalue", "some-value", time()+3600, "/", "example.com", 1);

设置cookie后，您可以检查它是否为空：

if (!empty($_COOKIE["uservalue"])){
    echo "<span style='color: white'> cookie isn't empty </span>";
}

在以下条件下，empty是true：

"" (an empty string)
0 (0 as an integer)
0.0 (0 as a float)
"0" (0 as a string)
NULL
FALSE
array() (an empty array)
var $var; (a variable declared, but without a value in a class)