upgrade from symfony 2.0 to 2.3

Upgrade information

Read the upgrade guides in symfony/symfony github repository:

• Upgrade 2.1
• Upgrade 2.2
• Upgrade 2.3
• Upgrade 2.4
• Upgrade 2.5
• Upgrade 2.6
• Upgrade 2.7
• Upgrade 3.0

There are also changelogs in the repository:

• CHANGELOG-2.2
• CHANGELOG-2.3

Backup your project!

Upgrading with composer

Get composer and put the symfony 2.3 standard edition's composer.json into your project root.

Now run composer update with your project's patch as working directory.

-> You will face some exceptions due to breaking changes exceptions. Google will help resolve those :)

Personal experience

In my legacy projects the most noticeable bc break from 2.0 to 2.1 was this one related to the form-builder because I had to update every form.

Before ( 2.0 )

use Symfony\Component\Form\FormBuilder;public function buildForm(FormBuilder $builder, array $options)

After ( 2.1+ )

use Symfony\Component\Form\FormBuilderInterface;public function buildForm(FormBuilderInterface $builder, array $options)

Upgrading is in general simple, as you only have to update the version constraints in your composer.json according to the standard distribution and issuing

php composer.phar update

But 2.3 has some backwards compatibility breaks. So read carefully every upgrade document for necessary code changes.

• from 2.0 to 2.1
• from 2.1 to 2.2
• from 2.2 to 2.3