Serving images from outside of document root

问题

Is it possible?

Let's say my directory structure looks like this:

/data
    /data/images
/public

The document root is in the "public" directory. This won't work, of course:

<img src="/../data/images/1.png" alt="" />

But maybe it's possible to enable serving images from directory above document root somehow? I would like to know.

回答1:

The most common way is an Alias:

Alias /data/ /wherever/your/data/are/

回答2:

Another way (say if you can't set an alias...) would be to use a script as the image source eg:

<img src="image.php?img=myImage.jpg" />

image.php would be similar to:

<?php
  header('Content-Type: image/jpg');
  readfile("../img/" . $_GET['img']);
?>

Of course you'd need to extend the script to filter $_GET['img'], as well as detect and set the right content type. Your script could even resize the image according to other parameters passed in the query string.

来源：https://stackoverflow.com/questions/3131562/serving-images-from-outside-of-document-root