By François Zaninotto, Fabien Potencier

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As with most getter methods in symfony, both the $request->getParameter() method in the action and the $sf_params->get() method in the template (which, as a matter of fact, calls the same method on the same object) accept a second argument: the default value to be used if the request parameter is not present. php). They are grouped in modules, according to their function in the application. Writing templates is facilitated by helpers, which are functions provided by symfony that return HTML code.

Listing 5-6 - YAML Boolean Values Syntax Listing 5-6 true_value: true false_value: false Don’t hesitate to add comments (starting with the hash mark, #) and extra spaces to values to make your YAML files more readable, as shown in Listing 5-7. com 59 # extra spaces allow nice alignment of In some symfony configuration files, you will sometimes see lines that start with a hash mark (and, as such, ignored by the YAML parsers) but look like usual settings lines. This is a symfony convention: the default configuration, inherited from other YAML files located in the symfony core, is repeated in commented lines in your application configuration, for your information.

Parameter Holders Many of the symfony classes contain a parameter holder. It is a convenient way to encapsulate attributes with clean getter and setter methods. For instance, the sfRequest class holds a parameter holder that you can retrieve by calling the getParameterHolder() method. Each parameter holder stores data the same way, as illustrated in Listing 2-14. Listing 2-14 - Using the sfRequest Parameter Holder $request->getParameterHolder()->set('foo', 'bar'); echo $request->getParameterHolder()->get('foo'); => 'bar' Listing 2-18 Most of the classes using a parameter holder provide proxy methods to shorten the code needed for get/set operations.

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