To pass info via GET:
header('Location: otherScript.php?var1=val1&var2=val2');
Session:
// first script
session_start();
$_SESSION['varName'] = 'varVal';
header('Location: second_script.php'); // go to other
// second script
session_start();
$myVar = $_SESSION['varName'];
Post: Take a look at this.