php if statement

[baris]

Why don't we check just the folder?

Code:

function sic_change_theme() {
    global $TEMPLATE, $SITEURL;
    $iPhoneTemplate = 'iPhone';
    $file = $SITEURL . '/theme/' . $iPhoneTemplate;
    $found = strpos($_SERVER['HTTP_USER_AGENT'], 'iPhone');
    if (file_exists($file) && $found == true) {
        $TEMPLATE = $iPhoneTemplate;
    }
}