Session 变量在 php 页面中不同

Question

Duly note, I am using session_start(); preceding any code in both these php files:

Problem in a minimally-reduced format:

index.php

<?php
  session_start();
  $_SESSION['msg'] = 'hello';
?>

When invoking add_to_cart.php using ajax in index.php:

              $.ajax({
                type:"POST",
                url:"add_to_cart.php",
                async: false, //tested with this true and now false
                data:{test_product:productName},
                success:function(response){
                  alert(response);
                }
              });

add_to_cart.php:

<?php
    session_start();

    echo json_encode($_SESSION['msg']);
?>

The output of the alert is null

I am running php 7.4 on nginx, on ubuntu.

Answer 1

Please try this.

Remove $_SESSION['cart'] = array(); from index.php

And save item in cart as following in add_to_cart.php.

$_SESSION['cart'][] = [$productName,$productQty];

Answer 2

I have tested on another machine running Apache instead of Nginx and it worked. The var_dump of session immediately on the ajax php file was null on nginx however, had contents intact on the apache server.