[Opserty]

You need some kind of input...like what you are going to check is the category of.

Example:

PHP Code:

$input = 'Socks';
switch($input)
{
    case 'Socks':
        echo 'Socks';
        break;
    case 'Belts':
        echo 'Belts';
        break;
    default:
        echo 'No matches';
        break;
}

/*=============================
 * Outputs: 'Socks'
 *=============================
 *
 * If we say 
 * 
 * $input = 'Cheese';
 * 
 * Output: 'No matches';
 */

// ############ EVEN BETTER WAY ##############

$input = 'Socks';

switch($input)
{
    case 'Your':
    case 'Categories':
    case 'Here':
        echo $input;
        break;
    default:
        echo 'No matches found';
        break;
} 


If you don't know any PHP or very little you may want to consider at least learning the basic concepts before you go about editing files e.t.c.