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The first line in Listing 12-1, server.modules, tells LightTPD which modules it should load and enable at startup. Similar to Apache modules, LightTPD modules extend the base functionality of LightTPD. In Listing 12-1, we enabled the following modules: mod_rewrite: Allows you to rewrite, or modify, the URL that was used to access a server resource. For example, you could configure mod_rewrite so that requests for URLs ending with .html are stripped of the .html suffix and processed by Ruby on Rails. For example, /catalog/index.html is rewritten to /catalog/index. mod_access: Allows you to deny access to certain files that match a regular expression pattern. mod_fastcgi: Used to communicate with external FastCGI processes. mod_compress: Adds support for deflate, gzip2, and bzip2 content compression. Enabling content compression allows you to save bandwidth and makes it faster for the browser to download the content. mod_accesslog: Logs each request to a file or other supported destination. Each module is configured separately and adds a set of options that can be used in the configuration file.

Now, you ve got plenty of things that return truth values. (In fact, given the fact that all values can be interpreted as truth values, all expressions return them.) But you may want to check for

Note The quickest way to view what type of data is being returned is to reverse engineer the methods. Perform

Note See the module documentation for more information. You can find links for each module s documentation at http://trac.lighttpd.net/trac/wiki/Docs.

more than one condition. For example, let s say you want to write a program that reads a number and checks whether it s between 1 and 10 (inclusive). You can do it like this: number = input('Enter a number between 1 and 10: ') if number <= 10: if number >= 1: print 'Great!' else: print 'Wrong!' else: print 'Wrong!' This will work, but it s clumsy. The fact that you have to write print 'Wrong!' in two places should alert you to this clumsiness. Duplication of effort is not a good thing. So what do you do It s so simple: if number <= 10 and number >= 1: print 'Great!' else: print 'Wrong!'

Now that you have all the products in the store, let s clean up the result set. We performed a simple loop to extract only the product objects: foreach ($productCollection as $id => $data) { $allProducts[] = $data; } Within each product objects are key value arrays: $productIds = array_keys($allProducts); This will return all the product ids so you can perform a random draw. You ll use the rand() method from PHP to extract five products from the collection (www.php.net/manual/en/function.rand.php). To use the rand() method, give PHP a start number and an ending number. Because an array index starts at 0, you need to obtain only the end value, which is the total size of the array: $totalProductIds = count($productIds); Now you loop five times: for ($i=0; $i<$maxCount; $i++) Draw a random number between 0 and the total size of the array: $randIndex = rand(0,$totalProductIds); Extract the random productId from the array: $randProductId = $productIds[$randIndex]; Then store the product object into the result set: $randProducts[] = $allProducts[$randProductId];