如果已登录，则重定向到某个页面

Question

I have a main page that has a log in link on it that takes the user to a login page. However, if a user is already logged in I want to take the user to another page, for example a info page.

I have this function:

function logged_in_redirect() {
if (logged_in() === true) {
    header('Location: client.php');
    exit();
}
}

I'm wondering where to put this? I've tried pretty much everything. If i put this on the login page, it does not redirect me when i am logged on. I've tried adding it as an onclick function for the link on the home page but it didn't work.

This is my logged_in() function:

function logged_in() {
return (isset($_SESSION['user_id'])) ? true : false;
}

Any suggestions?

Edit:

I have currently fixed the problem by making the button on the home page link to a test.php file which has this code:

<?php
include 'core/init.php';

if (isset($_SESSION["user_id"])) {
    header('Location: client.php');
}
else {
    header('Location: info.php');
}

?>

Is there any way around this?

Answer 1

If your session is set and the user is properly authenticated this will work.

You don't need extra function to check whether login is set unless you have a common file which is handling authentication related stuff and all the other files calling its function to check if the user is logged in..

Login Page:

<?php 

//check if the user is already loggedin
if(isset($_SESSION["user_id"]){
  //assuming client.php is in the same directoy
  header("Location: client.php"); //you don't need exit since it will be redirected
}

//your login stuff. if your user_id was not set this part will be executed

?>

Also don't forget to destroy session once you log out..