This article talks about session and cookie session control. If you don’t know about session and cookie session control or are interested in session and cookie session control, then we will Get up and read this article. Okay, without further ado, let’s get to the point
For a front-end developer, I think everyone is familiar with cookies. They often encapsulate some methods such as setcookie and getcookie. Session is like Like a most familiar stranger, we will use it when we cooperate with back-end developers on projects, but we don’t understand its essence. Let’s discuss it in detail
Storage location: Stored on the client
Function: This domain stores data across pages (we seem to generally use username, password)
Cookie generally contains information as shown below:
##Transmission: The following is an http request message
In every request sent, the cookie will be sent to the background along with the http messageThe relationship between cookie and sessionsession Below I use php language as a use case to explain sessionAs can be seen from the above, session is stored on the server side and is stored in the form of a file
session There are many features, such as expiration time, etc. Let's check it out below and open the php.ini file (it contains a lot of configuration information for php, I removed n many
comments)
<?php session_start(); header("Content-Type: text/html;charset=utf-8"); if ($_SESSION['username'] != 'success') { /* /php/index.php为当前文件路径 */ $string = <<< EOF <form action="/php/index.php" method="post"> <input type="text" name="value"> <input type="submit"> </form> EOF; echo $string; } if ($_SESSION['username'] == 'success') { echo "登录成功".PHP_EOL; } if ($_POST['value'] == 'ys') { $_SESSION['username'] = 'success'; echo "登录成功".PHP_EOL; } ?>
In this way, the unique session file can be found according to the session requested each time, and then see what this file looks like
username|S:7:"success";s|S:7:"success";ss|S:7:"success";
username|S:7:"success";
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