How to check Symfony version?

@domenico 

To check the version of Symfony, you can use the following methods:

1. Check the version in the composer.json file:

• Open the composer.json file located in the root directory of your Symfony project.
• Look for the "symfony/symfony" key in the "require" section. The version number is specified after the ":" character.

For example:

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"require": {
    "php": "^7.1.3",
    "symfony/symfony": "4.4.*"
},

In this example, the Symfony version is 4.4.

1. Check the version using the symfony command:

• Open a terminal and navigate to the root directory of your Symfony project.
• Run the following command:

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symfony version

This will output the version number of Symfony, for example:

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Symfony 4.4.11 (env: dev, debug: true)

In this example, the Symfony version is 4.4.11.