Use of Cookies in PHP

This article mainly introduces the use of cookies in PHP: adding/updating/deleting/getting cookies, automatically filling in the user's user name and password, and determining whether to log in for the first time. It has a good reference value.

Use of Cookies in PHP---Add/Update/Delete/Get Cookies and automatically fill in the user's username and password and determine whether it is the first time to log in

What is a cookie

The server saves user information on the client, such as login name, password, etc.

These data are like cookies , the amount of data is not large, the server can read it from the client when needed, and save it in the client's browser cache directory

① When the browser accesses cookie.php, the server returns the message with Set -Cookie:name=zxf;expire=Wed,21-Sep-2017 20:14 GMT will send an http response. When the browser obtains the message, it will save the cookie information to the local disk

② If we don’t have time (the third parameter)

The cookie will not be saved to the client. When the browser session ends, the cookie will expire

③ The cookie saves string information

④ The client can save multiple keys=>val

⑤ During the saving process, the cookie will be urlencoded in Chinese

The cookie can have multiple keys=> val, you can give different key values ​​and set different validity times

The code is as follows: xx.php

<?php
//添加cookie
setcookie("name","zxf",time()+3600);
//数组

/$arr = array(1,2,3); 
 $arr_str = serialize($arr); 
 setcookie("a",$arr_str,time()+3600); 

//获取cookie
 
var_dump($_COOKIE);

//更新cookie

setcookie("name","aaa",time()+3600);

//删除cookie

setcookie("name","",time()-20);

//删除所有

foreach ($_COOKIE as $key => $value) {
 setcookie($key,"",time()-1);
 }
echo "成功";
 ?>

If you delete the cookie If the key=>val has not been deleted, the cookie will be retained on the client. If all the cookies of this website are deleted, the browser will delete the cookie file.

Determine whether it is the first time Login

<?php

//先判断cookie里是否有上次的登录信息

if(!empty($_COOKIE[‘lastVisit&#39;])){

  echo “你上次登陆的时间是”.$_COOKIE[‘lastViat&#39;];

//更新时间

setcookie(“lastVisit”,”data(Y-m-d H:i:s)”, time()+3600);

}else{

//说明用户是第一次登陆

echo”第一次登陆”;

//更新时间

setcookie(“lastViait”,”data(“Y-m-d H:i:s”)”, time()+3600);

}
?>

When the login interface is opened, the user's username and password are automatically filled in

checklogin.php

//获取用户是否选中了保存id

if(!empty($_POST[‘cookie'])){

  setcookie(“id”,$id,time()-100);

}else{

  if(!empty($_COOKIE[‘id'])){

   setcookie(“id”,$id,time()-10);

}
}

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