session

Question

How to connect session_start? I tried but it fails

Answer 1

session_start() creates a session or resumes the current one based on a session identifier passed via a GET or POST request, or passed via a cookie.

Syntax:
session_start ([ array $options = array() ] ) : bool

Simple example:
<?php
// page1.php

session_start();

echo 'Welcome to page #1';

$_SESSION['favcolor'] = 'green';
$_SESSION['animal'] = 'cat';
$_SESSION['time'] = time();

// Works if session cookie was accepted
echo '<br /><a href="page2.php">page 2</a>';

// Or maybe pass along the session id, if needed
echo '<br /><a href="page2.php?' . SID . '">page 2</a>';
?>

Reference from:
https://www.php.net/manual/en/function.session-start.php