How can I put a PHP Variable in file_get_contents URL String?

Question

I would like change the 1 in the URL below and pass PHP variable pulled from the website URL. I have everything else working except I'm having trouble getting a variable working in the middle of the URL file_get_contents below.

$listingstring = file_get_contents('http://example.com/1/lsitngs/');

$listingstring = file_get_contents('http://example.com/?variable/lsitngs/');

Answer 1

Use double quotes for your string so you can place a variable inside of it and have it interpolated:

$listingstring = file_get_contents("http://example.com/$variable/lsitngs/");

You can also use concatenation:

$listingstring = file_get_contents('http://example.com/'.$variable.'/lsitngs/');