How to avoid session destroy in PHP

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PHP

jQuery

Hai ,

I set Session timeout 180 minutes in php.ini file,But session value destroy in every 10 minutes.

session will destroy when i call another page using ajax.

how can i solve it

What I have tried:

the ajax code is

function countdata()
var userid= "<?php echo $_SESSION['user_id']; ?>";
$.ajax({
type: "POST",
url: "./webservice/usercountnotifi.php",
data:{user_id:userid},
success: function(data){
document.getElementById('update1').innerHTML = data;
lastentry();
}

in php

<?php
	include_once '../Login/db_connect.php';
	include_once '../Login/Functions.php';
	sec_session_start();
	$mysqli = new mysqli(HOST, USER, PASSWORD, DATABASE);
	
	if(!isset($_SESSION['user_id']) )
	{
		header("location:../login.php");
		exit();
	}

	$userid = $_REQUEST['user_id']; 
	
	date_default_timezone_set("Asia/Kolkata");
	$startdate = date('Y-m-d');
});
?>

when i call usercountnotifi.php page the page resirect to login page