PHP half way home (4)

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The reason is that the previous BLOG writing system was unsuccessful. I need to understand the basic mechanism.

Start with Cookie and Session!
What is Cookie and Session?
A: storage mechanism !!!
Cookie: the data transmission method from the Web page to the Web page. the Client exists.

Session: a method to ensure that data remains valid on the page.

Session mechanism-tracking users based on a session on a website

Allows users to log on and display information based on their interests.

 

PHP session-a unique session ID to drive.

This ID is an encrypted random number.

The session will be stored on the client during its lifecycle.

Stored in cookies and transmitted through URLs on the Internet

Talk about cookies first
Overview:
A mechanism for storing data on a remote browser to identify and track users

Will exist on the user's hard disk. when the user logs on again, it will read the specific information

Format: user name: @ 网 ]]digital *.txt

Function:
Record Visitor Information

Transfer variables between pages

Store the viewed page in the Cooike folder to speed up re-access.

Usage:
Create: setcookie (name, value, expire, path, domain, secure)

Parameter description

Parameters	Description
Name	Required. name
Value	Required. cookie value
Expire	Validity period
Path	Server path
Domain	Domain name
Secure	Whether to transmit data over https

 

Read: $ _ COOKIE ['XXX'] Read

Delete:

Use setcookie (); setcookie ("name", "", time ()-1 );

 

Let's look at the SESSION.
Overview:
Prevent users from logging on to each opened page and using Session

The session is stored on the client, which is more efficient than the cookie during verification (you do not need to go to the Database to check the information every time)

Usage:
Start: session_start ();

Use: $ _ SESSION ['name'] = "Matter ";

Delete:

Unset ($ _ SESSION ['name']); // deletes a single attribute.
Session_destroy (); // delete the entire session and clear all resources!
$ _ SESSION = array (); // delete all sessions

 

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