php send value of 0 using $_GET variable

Question

How can i pass a $_GET variable value of '0' while checking if it exists? For example I normally check to see is the variable exists by:
$myVar= (!isset($_GET['t1'])? $_GET['t1'] : '');
or
$myVar= (!empty($_GET['t1'])? $_GET['t1'] : '');

but either both of these checks return false

Answer 1

Your first line isn't doing what you expect, because it's asking: is $_GET['t1'] not set? If it's not, $myvar = $_GET['t1']. If it is set, $myvar = ''.

$myVar= (!isset($_GET['t1'])? $_GET['t1'] : '');

So it should be:

$myVar= (isset($_GET['t1'])? $_GET['t1'] : '');