Get post ID from a link

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I guess you’re not after the current post/page ID, but rather trying to find the ID for some url from your site.

Then you should try out the handy url_to_postid() WordPress core function.

It returns the post/page ID if it exists, else 0.

Example:

echo url_to_postid( 'http://example.com/2014/11/14/hello-world' );

// Outputs the post ID as 1 in this example.

Update:

Reply to the comments: You could create a custom field, called e.g. url_offer, from the backend

Example for a custom field

and use:

$url_offer = get_post_meta( get_the_ID() , 'url_offer', true );

to retrieve it on the front end.