检查Cookie是否为空或在php中设置不起作用？

Question

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");
    }
?>

应该检测cookie是否为空，但是当cookie等于＆＃34;＆＃34;然后它运行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。不知道我在这里做错了什么= /如果有人可以提供帮助那就太棒了。

Answer 1

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>";
}

在下列情况下，

empty为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)