php - Pass and print a $_GET variable through an included file

Question

I have a php file index.php and its url is index.php?var=item I defined get variable in index.php

in index.php

<?php
    require "included.php";
    $var=$_GET['var'];
?>

I echoed this variable in my included.php like below

in included.php

<?php
    echo $var;
?>

When I launch index.php?var=item, its shows an error that var is not defined in included.php?

How to overcome this? I want to define some variables in index.php from url and do some staff in included file.

Answer 1

like Joachim Martinsen posted as a comment (I don't know why he hasn't just answered), you have to set the $var before including your file:

<?php
    $var=$_GET['var'];
    require "included.php";
?>

inlcuding in PHP basically just works like concatenating one file out of other files. so your original code would result in:

<?php
    echo $var;
    $var=$_GET['var']; 
?>

which obviously doesn't work because the variable is echoed before it is getting a value assigned.