兩種方式：1、使用“setcookie(cookiename,NULL)”語句將cookie的值設為空；2、使用“setcookie('cookiename','',time()-3600)”語句將cookie的過期時間設定為過去。
本教學操作環境：windows7系統、PHP7.1版，DELL G3電腦
php刪除/清除cookie的兩種方法
將cookie的值設為空,即：setcookie('cookiename', '')或setcookie(cookiename, NULL);
將cookie的過期時間設定為過去，即：setcookie('cookiename','',time()-3600);
方法一：將cookie的值設為空白
<?php
setcookie ( "cookie_user", "test", time () + 60 * 60 * 24 * 30 );
setcookie ( "cookie_pass", md5 ( "test" ), time () + 60 * 60 * 24 * 30 );
function logout() {
setcookie ( "cookie_user", "", time () + 60 * 60 * 24 * 30 );
setcookie ( "cookie_pass", "", time () + 60 * 60 * 24 * 30 );
}
/* http://www.manongjc.com/article/1253.html */
logout ();
echo $_COOKIE ['cookie_user'] . "<br />";
echo "You have successfully logged out.";
?>方法二：將cookie的過期時間設定為過去
<?php
setcookie ( "cookie_user", "test", time () + 60 * 60 * 24 * 30 );
setcookie ( "cookie_pass", md5 ( "test" ), time () + 60 * 60 * 24 * 30 );
function logout() {
setcookie ( "cookie_user", "test", time () - 100 );
setcookie ( "cookie_pass", md5 ( "test" ), time () - 100 );
}
logout ();
echo $_COOKIE ['cookie_user'] . "<br />";
echo "You have successfully logged out.";
?>推薦學習：《PHP影片教學》
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