为何在PHP中的cookie值读取失败？
在同一网站下，使用 setcookie("userLogin","TEST",time()+60*60*24); 语句设置了cookie值，在本页面能用echo $_COOKIE["userLogin"]; 读取，但转到同一网站的其他页面用echo $_COOKIE["userLogin"]; 就读取不了，是空值。请问是哪里出问题了？
回复讨论(解决方案)
你发上来的代码经我测试没有任何问题，可能是你的测试方法有问题，或你的环境有问题，或你的程序里有其它代码影响
cookie 有一个作用路径的问题（默认是当前路径）
即：如果你在子目录的文件中 setcookie 的话，那么只能在该子目录的程序中看到设置的 cookie 变量
鉴于网站文件数较多，不大可能都放在根目录中，所以应令 setcookie 的第 4 个参数为 /，即使cookie 在整个网站中都有效
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