A brief discussion of PHP syntax 6_PHP tutorial

Cookies and Sessions are mentioned at the end of the above article ("Talk about PHP Grammar (3)". This article will give some introductions to these two technologies.
We often pronounce Cookie as "Kuji", and also call it "Cookie". "Small dessert". It is a small file stored in the client's browser. It was developed to solve the problem of HTTP's one-time connection without memory, and can be used to track users or perform tracking on returning users. Confirm. PHP provides the setcookie() function to set cookies. Because cookies are part of the HTTP header, the setcookie() function must be called before the web page data is passed to the browser. The function is the same.
Cookie must be provided by the host; therefore, we must send a header that sets the cookie in the CGI program. The following is an example of calling the setcookie() function in PHP: setcookie("user","wind",time()+3600,"/php/","http://www.oso.com.cn");
?>
Among them, user is the name of the cookie; wind is the value of the cookie; time()+3600 is the validity time of the cookie; /php/ is the relevant path of the cookie; http://www.kunoso.com.cn
In fact, in addition to using this method to set cookies, we can also use the header() function such as: header("Set-Cookie:user=wind"), but this requires HTTP. You need to know the header information, so I don’t recommend using this method. It is more convenient to use setcookie()
When reading cookies, the browser will automatically check whether it is connected to a website. If there are cookies of the site, they will be automatically passed to the server. In PHP, the returned cookie will be used as a variable. After the cookie set above is returned, a $user variable will be formed, which The value is wind.
However, cookie has a fatal disadvantage, that is, if the client turns off cookie reception and cannot store cookies to the client, all operations will go wrong. Therefore, Session is provided in PHP4 instead. Cookie.

The biggest difference between Session and Cookie is that Cookie stores information on the client side, while Session stores it on the server side. In fact, Session provides a global variable for PHP scripts. The example is as follows:
Set a Session named user with the value wind
session_start();
$user="wind";
session_register("user");
? >
Read the Session and the result is displayed as "Welcome! wind"
?br> session_start();
echo "Welcome! $user";
?>
This article only briefly discusses Cookie and Session technology. For those who want to know more about this technology, please refer to other books.

http://www.bkjia.com/PHPjc/531867.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/531867.htmlTechArticleThe last article ("Talk about PHP syntax (3)" mentioned Cookie and Session, this article will focus on these two Let’s give some introduction to this technology. We often pronounce Cookie as “Kuji” and also call it “Small Dessert”...