创建 cookie <?php setcookie("user", "Alex Porter", time()+3600); ?> 取回 Cookie 的值 <?php // Print a cookie echo $_COOKIE["user"]; // A way to view all cookies print_r($_COOKIE); ?> isset() 函数来确认是否已设置了 cookie <html> <body> <?php if (isset($_COOKIE["user"])) echo "Welcome " . $_COOKIE["user"] . "!<br />"; else echo "Welcome guest!<br />"; ?> </body> </html> 删除 cookie <?php // set the expiration date to one hour ago setcookie("user", "", time()-3600); ?>