[Sean S]

Quick question, I'm trying to learn and create my own hacks. I have noticed that in many files, lines such as this have been used a lot, could someone please explain to me what this actually achieves?

PHP Code:

if ($_POST['do'] == 'this')
{
    globalize($_POST, array(
        'subject' => STR,
        'message' => STR,
        'summary' => STR,
        'category' => INT,
        'upload',
        'icon' => FILE
    )); 


like what does this mean? => STR, or => INT

thanks in advance for any info