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Caching

Caching can be very important to a project. Just a few calls to the Flickr API can take long enough to bore your average web user (depending on the calls you are making). I've built in caching that will access either a database or files in your filesystem. To enable caching, use the phpFlickr::enableCache() function. This function requires at least two arguments. The first will be the type of cache you're using (either "db" or "fs")

  1. If you're using database caching, you'll need to supply a PEAR::DB connection string. For example:

    $flickr->enableCache("db", "mysql://user:password@server/database");

    The third (optional) argument is expiration of the cache in seconds (defaults to 600). The fourth (optional) argument is the table where you want to store the cache. This defaults to flickr_cache and will attempt to create the table if it does not already exist.

  2. If you're using filesystem caching, you'll need to supply a folder where the web server has write access. For example:

    $flickr->enableCache("fs", "/var/www/phpFlickrCache");

    The third (optional) argument is, the same as in the Database caching, an expiration in seconds for the cache.

    Note: filesystem caching will probably be slower than database caching. I
    haven't done any tests of this, but if you get large amounts of calls, the
    process of cleaning out old calls may get hard on your server.

    You may not want to allow the world to view the files that are created during caching. If you want to hide this information, either make sure that your permissions are set correctly, or disable the webserver from displaying *.cache files. In Apache, you can specify this in the configuration files or in an .htaccess file with the following directives:

    <FilesMatch "\.cache$">
    Deny from all
    </FilesMatch>

    Alternatively, you can specify a directory that is outside of the web server's document root.


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