custom code to detect the URL /post and return the value

I have this peace of code :

add_filter('iphorm_element_value_product', 'mytheme_set_parameter');

function mytheme_set_parameter($value)
{
    // Check which post/URL we are on and return the values of the options we want ticked
    return array('Product1');
}

How can I find page URL I’m curently on and return that value?

thx