Convert URL to file system path

Is there a way to convert a web URL in to the absolute file system path (independent from OS)?

For example: I have an URL /images/test.jpg (http://www.example.com/images/test.jpg) and I need to get:

• `c:\path\to\webroot\images\test.jpg`` on Windows,
• /var/path/to/webroot/images/test.jpg on Linu开发者_JAVA技巧x.

Any way to do this in PHP?

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$str = "/images/test.jpg";
$str = realpath("." . $str);

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This will give you /images/test.jpg:

$path = str_replace($_SERVER['DOCUMENT_ROOT'], '', $path)

Where $_SERVER['DOCUMENT_ROOT'] gives you the document root directory under which the current script is executing.

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It sounds like you want the realpath function.