php删除/清除cookie的两种方法

php删除/清除cookie的两种方法

1. 将cookie的值设置为空,即：setcookie('cookiename', '')或者setcookie(cookiename, NULL);
2. 将cookie的过期时间设置为过去，即：setcookie('cookiename','',time()-3600); 

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.\";
?>

第二种方法：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.\";
?>