2009/8/26 Paul Gardiner <li...@glidos.net>:
> Paul Gardiner wrote:
>> I want to write a simple indexing script to display a
>> directory full of photos as a gallery of thumbnails.
>> (There are various solutions out there for this, but
>> they're all a bit more complicated than I need).
>> I've added a file in /etc/apache2/conf.d that
>> looks like this:
>> Alias /photos /home/public/photos
>> <Directory "/home/public/photos">
>>    AllowOverride None
>>    Order allow,deny
>>    Allow from all
>>    DirectoryIndex /cgi-bin/index.php
>> </Directory>
>> I use "Alias" so that I can leave the photos where they are
>> and not have to move them to DocumentRoot. I use "DirectoryIndex"
>> so that the script doesn't have to be in with the photos. My
>> problem is that the running script seems to have no way to
>> work out the photos are in /home/public/photos.
>> $_SERVER[REQUEST_URI] is "/photos/", but I can't see how to
>> derive the server path from that, since $_SERVER[DOCUMENT_ROOT]
>> is "/srv/www/htdocs".
>> $_SERVER[PHP_SELF] is "/cgi-bin/index.php", so no use either.
>> How can I do this? Is there a way to interrogate the alias,
>> or can I set a variable in the conf file that PHP can pick up?
> I've sussed it. If I use this apache2 conf file, where I
> tag the server path onto the end of the index url:
> Alias /photos /home/public/photos
> <Directory "/home/public/photos">
>    AllowOverride None
>    Order allow,deny
>    Allow from all
>    DirectoryIndex /cgi-bin/index.php/home/public/photos
> </Directory>
> then the script can pick up the path as $_SERVER[PATH_INFO]
> P.

Hi Paul,

Glad you got it working. I would add one note: I don't know if this is
what your actual code contains or if it's just in your emails, but not
quoting string indices in arrays is a Bad Idea (TM). i.e. I'd
recommend avoiding the use of something like $_SERVER[PATH_INFO] and
instead use $_SERVER['PATH_INFO']. While the unquoted version will
work much of the time, it's untrustworthy. In this case, PHP sees the
label PATH_INFO and looks for a constant named PATH_INFO. If it
doesn't find one, then it interprets the label as a string--which
allows things to work. However, if at some point you include code
which does a define('PATH_INFO', 'foo'); then what PHP will see is
$_SERVER['foo'], which probably isn't what you wanted.

This example is of course a little contrived, but unless you know that
there is a constant defined with the value you're using, and you want
to use that as your array index, then you should always quote string
array indices.

For more information check out

Of course, if you just left out the quotes for the purposes of posting
then you may happily ignore this message and carry on. :)

Cheers (I'm done butting in now),


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