Add a if else option and dynamic url option??

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What im trying to do is make this into an if else statement so that if the "URL" is equal to the "http://www.someurl.com/" below then it echos the array like it already does. I want the else statement to just echo something like the file_get_contents array but minus the $category and $slug variables and also to have the url be dynamic so the original url can be any and not just a "set" url.

 

Or just have the below array be able to have any link instead of the set one.

 

I hope im explaining this right if not I apologize and can go into further detail.

<?php 
    $post_id = get_post($post->ID); // get current post or page
    $slug = $post_id->post_name; // define slug as $slug
    $category = get_the_category($cat_name);
echo file_get_contents('http://www.someurl.com/' . $category . '/watch-' . $slug . '.html?share=embed');
?>

 

Is there a way to do this? I've been stuck on this for awhile now, any help is greatly appreciated!

 

Thanks