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Commit33676dc

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[symfony#3022] Adding a quick cookbook entry to highlight where the expression component is used in the framework
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‎book/security.rst

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* The second access rule is not examined as the first rule matched.
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.. _book-security-allow-if:
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Securing by an Expression
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~~~~~~~~~~~~~~~~~~~~~~~~~
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‎book/service_container.rst

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this dependency in the service container, the container takes care of all
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the work of instantiating the classes.
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.. _book-services-expressions:
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Using the Expression Language
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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‎components/expression_language/introduction.rst

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Single: Components; Expression Language
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The ExpressionLanguage Component
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=================================
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================================
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The ExpressionLanguage component provides an engine that can compile and
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evaluate expressions. An expression is a one-liner that returns a value

‎cookbook/expression/expressions.rst

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..index::
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single: Expressions in the Framework
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How to use Expressions in Security, Routing, Services, and Validation
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=====================================================================
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..versionadded::2.4
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The expression functionality was introduced in Symfony 2.4.
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In Symfony 2.4, a powerful:doc:`ExpressionLanguage</components/expression_language/introduction>`
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component was added to Symfony. This allows us to add highly customized
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logic inside configuration.
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The Symfony Framework leverages expressions out of the box in the following
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ways:
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*:ref:`Configuring services<book-services-expressions>`;
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*:ref:`Route matching conditions<book-routing-conditions>`;
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*:ref:`Checking security<book-security-expressions>` and
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:ref:`access controls with allow_if<book-security-allow-if>`;
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*:doc:`Validation</reference/constraints/Expression>`.
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For more information about how to create and work with expressions, see
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:doc:`/components/expression_language/syntax`.

‎cookbook/expression/index.rst

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Expressions
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===========
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..toctree::
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:maxdepth:2
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expressions

‎cookbook/index.rst

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doctrine/index
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email/index
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event_dispatcher/index
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expression/index
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form/index
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logging/index
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profiler/index

‎cookbook/map.rst.inc

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* :doc:`/cookbook/event_dispatcher/method_behavior`
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* (service container) :doc:`/cookbook/service_container/event_listener`
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* :doc:`/cookbook/expression/index`
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* :doc:`/cookbook/expression/expressions`
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* :doc:`/cookbook/form/index`
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* :doc:`/cookbook/form/form_customization`

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