There are multiple options to do that:
Command Line:
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php bin/console about |
And as result you will see something like this:
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---------------------- ------------------------------------------------- Symfony ---------------------- ------------------------------------------------- Version 3.4.43 End of maintenance 11/2020 Expired End of life 11/2021 ---------------------- ------------------------------------------------- |
Also you can use the command below
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php bin/console --version // if Symfony >= 3 app/console --version // if Symfony version < 3 |
Code:
You can take a look into the file:
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symfony/src/Symfony/Component/HttpKernel/Kernel.php |
And you can see the constant like below:
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const VERSION = '3.4.43'; |