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vendor/doctrine/annotations/docs/en/index.rst
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Deprecation notice
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==================
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PHP 8 introduced `attributes
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<https://www.php.net/manual/en/language.attributes.overview.php>`_,
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which are a native replacement for annotations. As such, this library is
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considered feature complete, and should receive exclusively bugfixes and
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security fixes.
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Introduction
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============
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Doctrine Annotations allows to implement custom annotation
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functionality for PHP classes and functions.
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.. code-block:: php
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class Foo
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{
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/**
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* @MyAnnotation(myProperty="value")
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*/
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private $bar;
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}
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Annotations aren't implemented in PHP itself which is why this component
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offers a way to use the PHP doc-blocks as a place for the well known
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annotation syntax using the ``@`` char.
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Annotations in Doctrine are used for the ORM configuration to build the
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class mapping, but it can be used in other projects for other purposes
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too.
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Installation
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============
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You can install the Annotation component with composer:
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.. code-block::
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$ composer require doctrine/annotations
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Create an annotation class
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==========================
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An annotation class is a representation of the later used annotation
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configuration in classes. The annotation class of the previous example
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looks like this:
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.. code-block:: php
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/**
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* @Annotation
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*/
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final class MyAnnotation
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{
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public $myProperty;
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}
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The annotation class is declared as an annotation by ``@Annotation``.
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:ref:`Read more about custom annotations. <custom>`
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Reading annotations
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===================
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The access to the annotations happens by reflection of the class or function
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containing them. There are multiple reader-classes implementing the
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``Doctrine\Common\Annotations\Reader`` interface, that can access the
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annotations of a class. A common one is
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``Doctrine\Common\Annotations\AnnotationReader``:
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.. code-block:: php
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use Doctrine\Common\Annotations\AnnotationReader;
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use Doctrine\Common\Annotations\AnnotationRegistry;
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// Deprecated and will be removed in 2.0 but currently needed
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AnnotationRegistry::registerLoader('class_exists');
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$reflectionClass = new ReflectionClass(Foo::class);
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$property = $reflectionClass->getProperty('bar');
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$reader = new AnnotationReader();
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$myAnnotation = $reader->getPropertyAnnotation(
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$property,
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MyAnnotation::class
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);
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echo $myAnnotation->myProperty; // result: "value"
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Note that ``AnnotationRegistry::registerLoader('class_exists')`` only works
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if you already have an autoloader configured (i.e. composer autoloader).
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Otherwise, :ref:`please take a look to the other annotation autoload mechanisms <annotations>`.
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A reader has multiple methods to access the annotations of a class or
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function.
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:ref:`Read more about handling annotations. <annotations>`
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IDE Support
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-----------
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Some IDEs already provide support for annotations:
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- Eclipse via the `Symfony2 Plugin <https://github.com/pulse00/Symfony-2-Eclipse-Plugin>`_
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- PhpStorm via the `PHP Annotations Plugin <https://plugins.jetbrains.com/plugin/7320-php-annotations>`_ or the `Symfony Plugin <https://plugins.jetbrains.com/plugin/7219-symfony-support>`_
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.. _Read more about handling annotations.: annotations
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.. _Read more about custom annotations.: custom
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