How to pass variables between php scripts?

Question

Is there any way to pass values and variables between php scripts?

Formally, I tried to code a login page and when user enter wrong input first another script will

Answer 1

The quick way would be to use either global or session variables.

global $variable = 'something';

The 'better' way of doing it would be to include the script and pass the variable by parameter like

// script1.php contains function 'add3'
function add3( $value ) {
  return $value + 3;
}

// script2.php
include "script1.php";
echo 'Value is '.add3(2); // Value is 5