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This can be useful when you want to print out a sentence containing a number, for example: >>> temp = 42 >>> print "The temperature is " + temp Traceback (most recent call last): File "<pyshell#61>", line 1, in print "The temperature is " + temp TypeError: cannot add type "int" to string >>> print "The temperature is " + `temp` The temperature is 42 The first print statement doesn t work because you can t add a string to a number The second one, however, works because I have converted temp to the string "42" by using the backticks..

Refresh your Magento site and see the results, as shown in Figure 10-8.

) ) ) )

Figure 10-8. Results of Hello World Okay, now give yourself a pat on the back. You have just created a Magento module! Now let s do some real-world stuff.

Here it is obvious that the two lists are equal but not identical. To summarize: Use == to see if two objects are equal, and use is to see if they are identical (the same object).

), ), ), )

Let s extend the Helloworld module to query a random list of products and display them to the user. You will build your own customize models as well as use Magento s core models.

Caution Avoid the use of is with basic, immutable values such as numbers and strings. The result is

The syntax of the configuration file uses the following format: option = value Options are usually grouped into modules, such as server.port and accesslog.filename. Supported value formats include strings, integers, booleans, arrays, and others.

\app \code \local \Definitivemagento \Helloworld \Block \Hi.php \Randomproducts.php \Model \Randomproducts.php \etc \config.xml \etc \modules \Definitivemagento_All.xml

in: The Membership Operator I have already introduced the in operator (in 2, in the section Membership ). It can be used in conditions, just like all the other comparison operators: name = raw_input('What is your name ') if 's' in name: print 'Your name contains the letter "s".' else: print 'Your name does not contain the letter "s".' Comparing Strings and Sequences Strings are compared according to their order when sorted alphabetically: >>> "alpha" < "beta" True If you throw in capital letters, things get a bit messy. (Actually, characters are sorted by their ordinal values. The ordinal value of a letter can be found with the ord function, whose inverse is chr.) To ignore the difference between uppercase and lowercase letters, use the string methods upper or lower: >>> 'FnOrD'.lower() == 'Fnord'.lower() True Other sequences are compared in the same manner, except that instead of characters you may have other types of elements: >>> [1, 2] < [2, 1] True If the sequences contain other sequences as elements, the same rule applies to these sequence elements: >>> [2, [1, 4]] < [2, [1, 5]] True

supported configuration syntax and options, located at http://trac.lighttpd.net/trac/ wiki/Docs%3AConfiguration and http://trac.lighttpd.net/trac/wiki/ Docs%3AConfigurationOptions, respectively.

You added a new Model directory. It will do the heavy lifting, but you need the Block to handle the view component. \app\code\local\Definitivemagento\Helloworld\Model\Randomproducts.php < php class Definitivemagento_Helloworld_Model_Randomproducts extends Mage_Core_Model_Abstract { public function getRandomProducts($maxCount = 5) { $randProducts = array(); $allProducts = array(); $productCollection = Mage::getModel('catalog/product') ->getCollection() ->addAttributeToSelect('*') ->getItems(); foreach ($productCollection as $id => $data) { $allProducts[] = $data; } $productIds = array_keys($allProducts); $totalProductIds = count($productIds); for ($i=0; $i<$maxCount; $i++) { $randIndex = rand(0,$totalProductIds); $randProductId = $productIds[$randIndex]; $randProducts[] = $allProducts[$randProductId]; } return $randProducts; } } There s a lot going on here. Similar to the Block class, you go ahead and extend the base core Model. The purpose of this model is to fetch the random set of products and return that data to the Block. There are numerous ways to pull a list of products from your store. If you re old school, you can go straight SQL by reviewing its open schema (www.magentocommerce.com/wiki/development/magento_database_diagram). But the most flexible way is to use Magento s models: $productCollection = Mage::getModel('catalog/product') This line of code allows you to ask Magento for its catalog product model. A full list of available models and methods can be found on its massive documentation page (http://docs.magentocommerce.com/). Be warned; this is not for the faint of heart. Once you have obtained the model, go ahead and grab the collection: ->getCollection() Then set the MySQL Select query to return all columns: ->addAttributeToSelect('*')

And finally return it as an array of items: ->getItems();