How to get a URL in PHP

I have a photo gallery and have to have the photos' URLs in their bottons. How can I do that in PHP?

The location of file is in 'http://localhost/jordan pagaduan/user_images...开发者_Go百科'

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'http://' . $_SERVER['HTTP_HOST'] . $['REQUEST_URI'] maybe this?

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$_SERVER['PHP_SELF'] may be what you're looking for.