How to modify the SESSION validity time in PHP?

How to modify the SESSION validity time in PHP?

1. Set the valid time of SESSION by using the function "setcookie()";

＜?php
session_start(); 
// 保存一天 
$lifeTime = 24 * 3600; 
setcookie(session_name(), session_id(), time() + $lifeTime, "/"); 
?＞

2. Set by using the "session_set_cookie_params" function;

＜?php 
// 保存一天 
$lifeTime = 24 * 3600; 
session_set_cookie_params($lifeTime); 
session_start();
$_SESSION["admin"] = true; 
?＞

3 , set in "session_start()".

<?php

session_start([
    &#39;cookie_lifetime&#39; => 60 * 60
]);

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