Read e-book online A Year With Symfony Writing healthy, reusable Symfony2 PDF

By Matthias Noback

ISBN-10: 9082120119

ISBN-13: 9789082120110

You recognize now find out how to create a Symfony2 program, with routing, controllers, entities or records, Twig templates and perhaps a few unit assessments. yet after those simple steps, a few matters will increase about...
The reusability of your code - How in the event you constitution your code to make it reusable in a destiny venture? or perhaps within the comparable venture, yet with a special view or in a console command?
The quality of the interior API you may have knowingly or unknowingly created - What are you able to do to make sure that your crew participants will comprehend your code, and may use it within the approach it was once intended for use? how are you going to make your code versatile adequate for use in occasions similar to the single you wrote it for?
The point of security of your software - Symfony2 and Doctrine appear to instantly make you invulnerable for famous assaults in your net program, like XSS, CSRF and SQL injection assaults. yet are you able to thoroughly depend on the framework? And what steps if you take to mend many of the last concerns?

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My objection to factory classes with static factory methods is that static code is global code and that executing that code may have side effects that can not be isolated (for instance in a test scenario). Besides, any dependency of such a static factory method has to be by definition static itself, which is also really bad for isolation and prevents you from replacing (part of) the creation logic by your own code. Factory objects (or factory services) are slightly better. However, the need for them very likely points to some kind of design problem.

Exception event are allowed to: • Set a proper Response object for this specific exception. • Replace the original Exception object. When none of the listeners has called setResponse() on the event object, the exception will be thrown (again), but this time it will not be handled automatically. So in case your display_errors PHP setting equals true, PHP just renders it as-is. $response->isRedirect() ) { // ensure that we actually have an error response if ($e instanceof HttpExceptionInterface) { // keep the HTTP status code and headers $response->setStatusCode($e->getStatusCode()); $response->headers->add($e->getHeaders()); } else { $response->setStatusCode(500); } } This is quite useful: we can enforce a certain status code to be used by adding an X-Status-Code header to the Response object (remember: this only works for exceptions that are caught by the HttpKernel), or by throwing exceptions that implement HttpExceptionInterface.

There are many ways to do this, and in this chapter I will describe most of them. Knowing your options enables you to make better choices when looking for a dependency injection pattern. Don’t use generation commands When you start using Symfony, you may be tempted to use commands provided by the SensioGeneratorBundle to generate bundles, controllers, entities and form types. I do not recommend this. These generated classes can be nice to keep as a reference for creating these classes manually, but in general they contain too much code you don’t need, or that you don’t need to begin with.

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A Year With Symfony Writing healthy, reusable Symfony2 by Matthias Noback


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