What is the usage of php $_session

php $_session usage: 1. Initialize the session variable, the code is [session_start();]; 2. Write and read the session, the code is [$_SESSION['keyword']= "php" ;].

php $_session usage:

When using PHP to apply a session, store the data in the session on the server , and then identify the client's information through the sessionID passed by the client, and extract the information.

Common operations of session in php: writing, reading, registering and deleting session.

Start of session

The function that marks the start of session use is session_start, and the session_start function is used to initialize session variables. The syntax is as follows:

session_start();

The return value is TRUE.

Writing and reading of session

In PHP, the use of session is completed by calling and reading the predefined array $_SESSION.

In the website page, assign the $_SESSION array on the registration page, and read the $_SESSION array on other pages.

The session in the registration page, for example:

<?php
session_start();
$_SESSION[&#39;keyword&#39;]= "php";
?>

The session in other pages, for example:

<?php
session_start();
echo $_SESSION[&#39;keyword&#39;];
?>

Run in sequence, the result is:

php

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