What are the features of Symfony?

Symfony features are: 1. URI recognition supports Reg detection, allowing the URL to be defined as you wish; 2. Twig templates are very suitable for processing complex website structures and page structure syntax; 3. Composer package management allows code dependencies The relationship becomes very clear; 4. Routing can limit hostname.

The features of Symfony are:

Mainly improves the abstraction level of the code. Compared with the simple PHP language that directly exposes underlying concepts, Symfony provides a set of concepts and tools to solve specific engineering problems, helping the majority of Coders to reduce repetitive work. Abstraction means being able to express complex concepts, processes, etc. in simpler terms.

Some introduction to Symfony:

1. Routing: can restrict hostname, which allows websites with a large number of public functions to share a set of codes; URI recognition supports Reg Detection allows URLs to be defined as desired; supports prefixes and imports for easy modularization.

2. Twig template: This is one of my favorite components. It provides a set of syntax that is different from PHP but is very suitable for processing complex website structures and page structures. Extension is very convenient and powerful. Common operations can be well expressed through extension. For example, if you need to cache a module of the page to redis, you can write a ViewExtension and use a method in the template to cache a specific module. It is very convenient. The code is also easy to manage.

3. Composer package management: Make the dependencies of the code very clear. And now there are many good third-party bundles, such as snc/redis-bundle for abstract redis, liip/imagine-bundle for image processing, hwi/oauth-bundle for third-party login, etc. As your own project matures, you can also separate the project's customization of Symfony and use composer to manage it, which feels pretty good.

4. Event, Listener and Services: Very convenient global function processing. The annoying thing is that it is very troublesome to configure. I use a yml configuration file, and I really lose a layer of skin trying to find the right syntax.

5. Doctrine ORM: One advantage is that you don’t have to worry about the details of the database, but only need to carefully design the objects that need to be persisted. The relationships between objects can be designed freely, and you no longer have to worry about the process from generating database structures to generating query statements. Another advantage is that when querying, you can use object-based queries instead of sql and dql, which rely on strings to express queries. Since sql is a simple string, it is very troublesome to express the control of the entire query logic in code.

6. Form component: Symfony provides the functions of form generation, submission and verification. The component abstracts three aspects: formType to maintain the values ​​that need to be filled in and saved, formTheme to define the html structure of the form, and validation to provide data validation functions. The shortcomings of this component are also obvious. The concept is too complicated. If you have to define a field yourself, you are simply asking for trouble.

7. Performance: Symfony provides an excellent component called profile, which can graphically display the execution time of each part of the code, the memory consumed, as well as the database query statements and the number of rows queried. , the index used. Using this tool to optimize the code can make the website run fast.

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