使用PHP将变量从一个页面传递到另一个页面

Question

Does anyone know what's wrong with the code below that prevents me from printing in File2.php the variable $myusername from File1.php.

I simply wanna print the variable $myusername, or if you know any other way of how to pass that variable that would be very helpful for me.

Here is my example:

File1.php

<?php 
$myusername=$_POST['myusername']; 

function getusername() 
{ 
   return $myusername;    
} 
?>

File2.php

<?php 
require_once('File1.php'); 
getusername(); 
?>

Answer 1

You need to declare $myusername as global when you are trying to access it from within function, you also need to print is somehow (e.g. echo) ;)

File1.php
<?php 
$myusername=$_POST['myusername']; 

function getusername() 
{ 
   global $myusername; // declare as global
   return $myusername;    
} 
?>

File2.php
<?php 
    require_once('File1.php'); 
    echo getusername();        // echo value
?>

Read more: PHP Variable scope. You could also pass it via $_SESSION.