PHP. How to pass variable and auto redirect to another PHP file

Question

I'm developing app for Facebook. Here when user open application should be checked If user already exists in database. I think I will use $_SESSIONto pass user's Id to checkIfExsists.php

So my FacebookGetId.php looks like:

<?php
...
$id = $user_profile['id'];
$_SESSION['id'] = $id;
?>

So $id for now is i.e. '12345' I just don't know how to make automatically redirect to checkIfExsists.php to check If that Id already exsists in database.

It should be something like: When application is launched, It should take User's Id and automatically redirect to checkIfExsists.phpand pass that Id.

If user exists checkIfExsists.php should redirect user to application.php, if not exists - It should redirect to registration.php

If user exists checkIfExsists.php should redirect user to application.php, if not exists - It should redirect to registration.php — Stanislovas Kalašnikovas
– Stanislovas Kalašnikovas, Commented Mar 24, 2015 at 8:55
You can use http_redirect("relpath", array("name" => "value"), true, HTTP_REDIRECT_PERM);. for more information Visit thislink, it will help you. — Hardik Bharadava
– Hardik Bharadava, Commented Mar 24, 2015 at 9:06
Duplicate of How to check Facebook User's ID already exists before lauching app? — C3roe
– C3roe, Commented Mar 24, 2015 at 12:21

Community · Accepted Answer · 2020-06-20 09:12:55Z

6

Use the header function

<?php
...
$id = $user_profile['id'];
$_SESSION['id'] = $id;
header('Location: checkIfExsists.php?id='.$id);
?>

on the checkIfExsists.php get the variable with

$id = $_GET["id"];

That would solve your problem the way you want it to be solved, but, this isn´t neccesarilly the way it should be solved, maybe inside checkIfExists.php should be a class instead of structured code with a public function to check existance checkExistance, so you will then just need:

include_once(checkIfExists.php);
$check = new checker();
$exists = $check->checkExistance($id) ;

this way you do not have to be jumping between files and you can have a better way to re-use code, regards.

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Mar 24, 2015 at 8:55

Loki

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5 Comments

Epodax Over a year ago

No need to pass the ID along with the URL, the ID is allready set in a SESSION

Loki Over a year ago

then the whole FacebookGetId.php is obsolet, cause all to do is to start a session on the checkIfExsist.php and get the id with $_SESSION['id']

Stanislovas Kalašnikovas Over a year ago

Thank you for an answer, but It returning me blank page, It shouldn't be blank, in checkIfExsists.php I'm using session_start(); $id = $_SESSION['id']; echo $id; and in top of page trying to print errors: ini_set('display_errors',1); ini_set('display_startup_errors',1); error_reporting(-1); but still empty, why can I get this problem?

Loki Over a year ago

I don't know what you do with the $id on the checkIfExsists.php but when you want to validate is i guess you check it against a Database. So when you verify that the id is existant you should implent a if function with another header. For example: if($id == $validate_id) { header('Location: application.php'); } else { header('Location: registration.php'); }

Stanislovas Kalašnikovas Over a year ago

Thank you, that worked for me. I missed ; that's why was blank screen.

NaijaProgrammer · Accepted Answer · 2015-03-24 08:57:37Z

3

Use this:

<?php
 session_start();
 $id = $user_profile['id'];
 $_SESSION['id'] = $id;
 header('Location: checkIfExsists.php');
?>

And on the checkIfExsists.php page, retrieve the variable so:

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

answered Mar 24, 2015 at 8:57

NaijaProgrammer

2,9202 gold badges27 silver badges33 bronze badges

1 Comment

Stanislovas Kalašnikovas Over a year ago

Thank you for an answer, but It returning me blank page, It shouldn't be blank, in checkIfExsists.php I'm using session_start(); $id = $_SESSION['id']; echo $id; and in top of page trying to print errors: ini_set('display_errors',1); ini_set('display_startup_errors',1); error_reporting(-1); but still empty, why can I get this problem?

Fares M. · Accepted Answer · 2015-03-24 08:55:48Z

1

Use header('Location:url_of_your_page.php?fbid='.$id). php header function

FacebookGetId.php

<?php
    ...
    $id = $user_profile['id'];
    $_SESSION['id'] = $id;
    header('Location:checkIfExsists.php?fbid='.$id)
?>

answered Mar 24, 2015 at 8:55

Fares M.

1,5461 gold badge17 silver badges18 bronze badges

2 Comments

Stanislovas Kalašnikovas Over a year ago

Thank you for an answer, but It returning me blank page, It shouldn't be blank, in checkIfExsists.php I'm using session_start(); $id = $_SESSION['id']; echo $id; and in top of page trying to print errors: ini_set('display_errors',1); ini_set('display_startup_errors',1); error_reporting(-1); but still empty, why can I get this problem?

Fares M. Over a year ago

@StanislovasKalašnikovas may be your $_SESSION['id'] has an empty value, try adding a string to your echo, eg. echo "Facebook ID : ".$_SESSION['id'].

zdeniiik · Accepted Answer · 2015-03-24 08:56:17Z

1

you can do it via GET and header for example :)

header('Location: checkIfExists.php?userID=12345');

in checkIfExists.php

echo $_GET["userID"]

or in checkIfExists.php just start sessions a load ID from session :)

answered Mar 24, 2015 at 8:56

zdeniiik

2424 silver badges14 bronze badges

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