PHP storing session data, storing userid in session

Question

Sorry but I'm new to this. The following code only displays 'Please login'. Code does work but it's not doing what I want it to, I'm trying to store userid in a session. Here is my code

<?php

    if(!isset($_SESSION)) session_start();


    if(isset($_POST['userid'])){
         $userid = $_POST['userid']; 
         $_SESSION['userid']=$userid;
         echo "Welcome $_SESSION[userid]";
    }

    if (!isset($_SESSION['userid'])){
        echo "Please login";
        exit;
    }
    ?>

Answer 1

session_start() should be at the beginning without any condition. And also one extra closing bracket ) in the second if condition statement. Try this:

 <?php
   session_start();


        if(isset($_POST['userid'])){
            $_SESSION['userid']= $_POST['userid'];
            echo "Welcome {$_SESSION['userid']}";
        }

        if (!$_SESSION['userid']){
            echo "Please login";
            exit;
        }