如何使用 PHP 从多个页面访问 session 变量

Question

I want to access $_SESSION['roleid'] in master.php . master.php is included in every page. I'm only able to access $_SESSION['roleid'] in dashboard.php after user login. How to access $_SESSION['roleid'] in every page.

<?php
session_start();
if($_SESSION['login']==1) {
    $_SESSION['loggedIn'] = true;  
    $role_id1 = $_GET['role_id'];
    // store here in session
    $name=$_GET['name'];
    $_SESSION['roleid'] = $role_id1;
    // $role_id=$_SESSION['roleid'];

    $a=$_SESSION['roleid'];
    // echo $a;die;
     if(isset($_SESSION["roleid"])){
    header("location:api/dashboard.php?role_id=$a?name=$name");
}
} else {
    header("location:index.php");
    echo "login unsuccessful.";
}
?>

Answer 1

session_start()

function, which page we want acess session variables we have to first call session start function on that page then we can access session

Page 1:

session_start();

Set session variables:

$_SESSION["color"] ="green";
echo "Session variables are set.";

Page2:

session_start();

echo “my favcolor is“.$_SESSION["color"]; /*here it will display my fav color is green*/

Answer 2

To be able to access the session variables you need to call session_start(); on top of every page that will use the session variable. After the start call has been made you can use session variables like this echo $_SESSION["my_var"]; and this to set the content $_SESSION["my_var"] = "Var content"; , if you are unsure what the session actually belongs it is possible to check the content of the session by doing var_dump($_SESSION); . This will show all the data the session contains since it is passed as an array.

Please do remember that a session is not recursive through subdomains because of the cookie that is being used to track which session belongs to who. A session is also dependent on that headers are not sent yet since it needs to interact with the cookies.

To delay sending of headers do this: 1. Call ob_start(); at the completely top of the scripts that needs to set multiple headers 2. Do the things you need to do like set headers and so on 3. Call ob_end_flush(); to send the headers.

Here is the offical PHP docs on this: https://www.php.net/manual/en/function.ob-start.php https://www.php.net/manual/en/function.ob-end-flush.php

Answer 3

you should check $_SESSION['roleid'] : * if having $_SESSION['roleid'] , you will get it. On that code, you store $_GET['role_id'] to $_SESSION['roleid'] but $_GET['role_id'] have no in all page, it's only in dashboard. I think that. You should try.