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Basic use of cookies in php
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- 2021-03-16 10:10:344118browse
1. Cookie Introduction
Cookie is a mechanism that stores data on the remote browser side and uses it to track and identify users. Cookie is completely maintained on the client, such as: IE firefox When the client disables cookie, it will no longer be used.
2.Cookie configuration and application
Setcookie(string name, string value, int expire,string path, string domain, int secure);
nameis the cookie variable name identifier. You can use it to reference cookie variables in PHP just like using ordinary variable names; (required)valueis cookie The initial value of the variable; (required)expireIndicates the validity time of the cookie variable; (optional.)pathThe relative path of the cookie variable; (Optional.)domainRepresents the website of the cookie variable; (Optional .)secureis valid only whenhttpsis securely transmitted. (Optional.)
3. Receive and process cookies
<?php
$value = "my cookie value";// 发送一个简单的 cookie
setcookie("TestCookie",$value);
?>
...
<html>
<body>echo $TestCookie; echo $CookieArray[0]; echo $_COOKIE["TestCookie"]; echo $HTTP_COOKIE_VARS["TestCookie"];
4. Delete cookies
To delete an existing Cookie, there are two ways:
SetCookie("TestCookie", "");
SetCookie("TestCookie", "value" , time()-1 / time() );
##5. Restrictions on using cookies
- Must be set before the content of the
HTML
file is output; - Different browsers treat
Cookie
's handling is inconsistent and sometimes produces erroneous results. The limit is on the client side. - The maximum number of
Cookie
that can be created by a browser is 30, and each cannot exceed 4KB. EachWEBsite can set The total number of cookies cannot exceed 20.
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