两种方式：1、使用“setcookie(cookiename,NULL)”语句将cookie的值设置为空；2、使用“setcookie('cookiename','',time()-3600)”语句将cookie的过期时间设置为过去。
本教程操作环境：windows7系统、PHP7.1版，DELL G3电脑
将cookie的值设置为空,即：setcookie('cookiename', '')或者setcookie(cookiename, NULL);
将cookie的过期时间设置为过去，即：setcookie('cookiename','',time()-3600);
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方法一：将cookie的值设置为空
<?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：将cookie的过期时间设置为过去
<?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.";
?>推荐学习：《PHP视频教程》
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