What are the two ways to delete cookies in php

Two ways: 1. Use the "setcookie(cookiename,NULL)" statement to set the cookie value to empty; 2. Use "setcookie('cookiename','',time()-3600)" statement sets the cookie's expiration time to the past.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php delete/clear cookies One method

Set the cookie value to empty, that is: setcookie('cookiename', '') or setcookie(cookiename, NULL);

Set the cookie expiration time For the past, that is: setcookie('cookiename','',time()-3600);

Method 1: Set the cookie value to empty

<?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 [&#39;cookie_user&#39;] . "<br />";
echo "You have successfully logged out.";
?>

Method 2: Set the cookie expiration time to the past

<?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 [&#39;cookie_user&#39;] . "<br />";
echo "You have successfully logged out.";
?>

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