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New in version 2.4
The expression functionality was introduced in Symfony 2.4.
In Symfony 2.4, a powerful ExpressionLanguage component was added to Symfony. This allows us to add highly customized logic inside configuration.
The Symfony Framework leverages expressions out of the box in the following ways:
- Configuring services;
- Route matching conditions;
- Checking security and access controls with allow_if;
For more information about how to create and work with expressions, see The Expression Syntax.