minor #5955 use single quotes for YAML strings (snoek09)

This PR was squashed before being merged into the 2.3 branch (closes #5955).

Discussion
----------

use single quotes for YAML strings

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets | #5935

Commits
-------

81b96b6 use single quotes for YAML strings

Author: xabbuh

best_practices/business-logic.rst

@@ -145,7 +145,7 @@ the class namespace as a parameter:
 
     services:
         app.slugger:
-            class: "%slugger.class%"
+            class: '%slugger.class%'
 
 This practice is cumbersome and completely unnecessary for your own services:
 

best_practices/controllers.rst

@@ -43,7 +43,7 @@ configuration to the main routing configuration file:
 
     # app/config/routing.yml
     app:
-        resource: "@AppBundle/Controller/"
+        resource: '@AppBundle/Controller/'
         type:     annotation
 
 This configuration will load annotations from any controller stored inside the

book/configuration.rst

@@ -21,14 +21,14 @@ format you prefer:
             - { resource: security.yml }
 
         framework:
-            secret:          "%secret%"
-            router:          { resource: "%kernel.root_dir%/config/routing.yml" }
+            secret:          '%secret%'
+            router:          { resource: '%kernel.root_dir%/config/routing.yml' }
             # ...
 
         # Twig Configuration
         twig:
-            debug:            "%kernel.debug%"
-            strict_variables: "%kernel.debug%"
+            debug:            '%kernel.debug%'
+            strict_variables: '%kernel.debug%'
 
         # ...
 
@@ -226,7 +226,7 @@ the configuration file for the ``dev`` environment.
             - { resource: config.yml }
 
         framework:
-            router:   { resource: "%kernel.root_dir%/config/routing_dev.yml" }
+            router:   { resource: '%kernel.root_dir%/config/routing_dev.yml' }
             profiler: { only_exceptions: false }
 
         # ...

book/doctrine.rst

@@ -64,11 +64,11 @@ information. By convention, this information is usually configured in an
             # app/config/config.yml
             doctrine:
                 dbal:
-                    driver:   "%database_driver%"
-                    host:     "%database_host%"
-                    dbname:   "%database_name%"
-                    user:     "%database_user%"
-                    password: "%database_password%"
+                    driver:   '%database_driver%'
+                    host:     '%database_host%'
+                    dbname:   '%database_name%'
+                    user:     '%database_user%'
+                    password: '%database_password%'
 
         .. code-block:: xml
 
@@ -162,7 +162,7 @@ for you:
             doctrine:
                 dbal:
                     driver: pdo_sqlite
-                    path: "%kernel.root_dir%/sqlite.db"
+                    path: '%kernel.root_dir%/sqlite.db'
                     charset: UTF8
 
         .. code-block:: xml

book/page_creation.rst

@@ -477,14 +477,14 @@ is ``app/config/config.yml``:
         # ...
 
         framework:
-            secret: "%secret%"
+            secret: '%secret%'
             router:
-                resource: "%kernel.root_dir%/config/routing.yml"
+                resource: '%kernel.root_dir%/config/routing.yml'
             # ...
 
         twig:
-            debug:            "%kernel.debug%"
-            strict_variables: "%kernel.debug%"
+            debug:            '%kernel.debug%'
+            strict_variables: '%kernel.debug%'
 
         # ...
 

book/routing.rst

@@ -168,7 +168,7 @@ file:
         # app/config/config.yml
         framework:
             # ...
-            router: { resource: "%kernel.root_dir%/config/routing.yml" }
+            router: { resource: '%kernel.root_dir%/config/routing.yml' }
 
     .. code-block:: xml
 
@@ -1181,7 +1181,7 @@ configuration:
 
         # app/config/routing.yml
         app:
-            resource: "@AppBundle/Controller/"
+            resource: '@AppBundle/Controller/'
             type:     annotation # required to enable the Annotation reader for this resource
 
     .. code-block:: xml
@@ -1232,7 +1232,7 @@ directory are parsed and put into the routing.
 
             # app/config/routing.yml
             app:
-                resource: "@AcmeOtherBundle/Resources/config/routing.yml"
+                resource: '@AcmeOtherBundle/Resources/config/routing.yml'
 
         .. code-block:: xml
 
@@ -1271,7 +1271,7 @@ suppose you want to prefix all routes in the AppBundle with ``/site`` (e.g.
 
         # app/config/routing.yml
         app:
-            resource: "@AppBundle/Controller/"
+            resource: '@AppBundle/Controller/'
             type:     annotation
             prefix:   /site
 

book/service_container.rst

@@ -259,8 +259,8 @@ parameter and uses it in the service definition.
 
         # app/config/parameters.yml
         parameters:
-            # This will be parsed as string "@securepass"
-            mailer_password: "@@securepass"
+            # This will be parsed as string '@securepass'
+            mailer_password: '@@securepass'
 
 .. note::
 
@@ -398,7 +398,7 @@ configuration.
 
         # app/config/config.yml
         imports:
-            - { resource: "@AcmeHelloBundle/Resources/config/services.yml" }
+            - { resource: '@AcmeHelloBundle/Resources/config/services.yml' }
 
     .. code-block:: xml
 
@@ -475,7 +475,7 @@ invokes the service container extension inside the FrameworkBundle:
             secret:          xxxxxxxxxx
             form:            true
             csrf_protection: true
-            router:        { resource: "%kernel.root_dir%/config/routing.yml" }
+            router:        { resource: '%kernel.root_dir%/config/routing.yml' }
             # ...
 
     .. code-block:: xml

book/translation.rst

@@ -615,7 +615,7 @@ not empty, add the following:
         AppBundle\Entity\Author:
             properties:
                 name:
-                    - NotBlank: { message: "author.name.not_blank" }
+                    - NotBlank: { message: 'author.name.not_blank' }
 
     .. code-block:: xml
 

book/validation.rst

@@ -302,7 +302,7 @@ rules). In order to validate an object, simply map one or more constraints
 to its class and then pass it to the ``validator`` service.
 
 Behind the scenes, a constraint is simply a PHP object that makes an assertive
-statement. In real life, a constraint could be: "The cake must not be burned".
+statement. In real life, a constraint could be: 'The cake must not be burned'.
 In Symfony, constraints are similar: they are assertions that a condition
 is true. Given a value, a constraint will tell you if that value
 adheres to the rules of the constraint.
@@ -639,7 +639,7 @@ this method must return ``true``:
         AppBundle\Entity\Author:
             getters:
                 passwordLegal:
-                    - "True": { message: "The password cannot match your first name" }
+                    - 'True': { message: 'The password cannot match your first name' }
 
     .. code-block:: xml
 
@@ -945,8 +945,8 @@ username and the password are different only if all other validation passes
                 - Strict
             getters:
                 passwordLegal:
-                    - "True":
-                        message: "The password cannot match your username"
+                    - 'True':
+                        message: 'The password cannot match your username'
                         groups: [Strict]
             properties:
                 username:

components/dependency_injection/advanced.rst

@@ -128,4 +128,4 @@ service by asking for the ``bar`` service like this::
         services:
            foo:
              class: Example\Foo
-           bar: "@foo"
+           bar: '@foo'

components/dependency_injection/parentservices.rst

@@ -63,14 +63,14 @@ The service config for these classes would look something like this:
             newsletter_manager:
                 class: NewsletterManager
                 calls:
-                    - [setMailer, ["@my_mailer"]]
-                    - [setEmailFormatter, ["@my_email_formatter"]]
+                    - [setMailer, ['@my_mailer']]
+                    - [setEmailFormatter, ['@my_email_formatter']]
 
             greeting_card_manager:
-                class: "GreetingCardManager"
+                class: 'GreetingCardManager'
                 calls:
-                    - [setMailer, ["@my_mailer"]]
-                    - [setEmailFormatter, ["@my_email_formatter"]]
+                    - [setMailer, ['@my_mailer']]
+                    - [setEmailFormatter, ['@my_email_formatter']]
 
     .. code-block:: xml
 

components/dependency_injection/types.rst

@@ -199,7 +199,7 @@ Another possibility is just setting public fields of the class directly::
             newsletter_manager:
                 class: NewsletterManager
                 properties:
-                    mailer: "@my_mailer"
+                    mailer: '@my_mailer'
 
     .. code-block:: xml
 

components/routing/hostname_pattern.rst

@@ -183,9 +183,9 @@ instance, if you want to match both ``m.example.com`` and
                 host:     "m.{domain}"
                 defaults:
                     _controller: AcmeDemoBundle:Main:mobileHomepage
-                    domain: "%domain%"
+                    domain: '%domain%'
                 requirements:
-                    domain: "%domain%"
+                    domain: '%domain%'
 
             homepage:
                 path:  /
@@ -246,7 +246,7 @@ You can also set the host option on imported routes:
     .. code-block:: yaml
 
         acme_hello:
-            resource: "@AcmeHelloBundle/Resources/config/routing.yml"
+            resource: '@AcmeHelloBundle/Resources/config/routing.yml'
             host:     "hello.example.com"
 
     .. code-block:: xml

cookbook/assetic/yuicompressor.rst

@@ -33,12 +33,12 @@ stylesheets:
 
         # app/config/config.yml
         assetic:
-            # java: "/usr/bin/java"
+            # java: '/usr/bin/java'
             filters:
                 yui_css:
-                    jar: "%kernel.root_dir%/Resources/java/yuicompressor.jar"
+                    jar: '%kernel.root_dir%/Resources/java/yuicompressor.jar'
                 yui_js:
-                    jar: "%kernel.root_dir%/Resources/java/yuicompressor.jar"
+                    jar: '%kernel.root_dir%/Resources/java/yuicompressor.jar'
 
     .. code-block:: xml
 

cookbook/bundles/best_practices.rst

@@ -342,7 +342,7 @@ The end user can provide values in any configuration file:
 
         # app/config/config.yml
         parameters:
-            acme_blog.author.email: "[email protected]"
+            acme_blog.author.email: '[email protected]'
 
     .. code-block:: xml
 

cookbook/configuration/environments.rst

@@ -190,7 +190,7 @@ this code and changing the environment string.
 
             doctrine:
                dbal:
-                   logging: "%kernel.debug%"
+                   logging: '%kernel.debug%'
                    # ...
 
         .. code-block:: xml

cookbook/configuration/external_parameters.rst

@@ -70,8 +70,8 @@ You can now reference these parameters wherever you need them.
             dbal:
                 driver    pdo_mysql
                 dbname:   symfony_project
-                user:     "%database.user%"
-                password: "%database.password%"
+                user:     '%database.user%'
+                password: '%database.password%'
 
     .. code-block:: xml
 

cookbook/configuration/override_dir_structure.rst

@@ -130,7 +130,7 @@ the ``extra.symfony-web-dir`` option in the ``composer.json`` file:
             # ...
             assetic:
                 # ...
-                read_from: "%kernel.root_dir%/../../public_html"
+                read_from: '%kernel.root_dir%/../../public_html'
 
         .. code-block:: xml
 

cookbook/configuration/using_parameters_in_dic.rst

@@ -36,7 +36,7 @@ Now, examine the results to see this closely:
             # true, as expected
 
         my_bundle:
-            logging: "%kernel.debug%"
+            logging: '%kernel.debug%'
             # true/false (depends on 2nd parameter of AppKernel),
             # as expected, because %kernel.debug% inside configuration
             # gets evaluated before being passed to the extension

cookbook/console/logging.rst

@@ -87,7 +87,7 @@ First configure a listener for console exception events in the service container
             kernel.listener.command_dispatch:
                 class: AppBundle\EventListener\ConsoleExceptionListener
                 arguments:
-                    logger: "@logger"
+                    logger: '@logger'
                 tags:
                     - { name: kernel.event_listener, event: console.exception }
 
@@ -185,7 +185,7 @@ First configure a listener for console terminate events in the service container
             kernel.listener.command_dispatch:
                 class: AppBundle\EventListener\ErrorLoggerListener
                 arguments:
-                    logger: "@logger"
+                    logger: '@logger'
                 tags:
                     - { name: kernel.event_listener, event: console.terminate }
 

cookbook/deployment/heroku.rst

@@ -45,7 +45,7 @@ change the value of ``path`` from
             # ...
             nested:
                 # ...
-                path: "php://stderr"
+                path: 'php://stderr'
 
 Once the application is deployed, run ``heroku logs --tail`` to keep the
 stream of logs from Heroku open in your terminal.

cookbook/deployment/platformsh.rst

@@ -48,22 +48,22 @@ Platform.sh how to deploy your application (read more about
     # to the application in the PLATFORM_RELATIONSHIPS variable. The right-hand
     # side is in the form `<service name>:<endpoint name>`.
     relationships:
-        database: "mysql:mysql"
+        database: 'mysql:mysql'
 
     # The configuration of app when it is exposed to the web.
     web:
         # The public directory of the app, relative to its root.
-        document_root: "/web"
+        document_root: '/web'
         # The front-controller script to send non-static requests to.
-        passthru: "/app.php"
+        passthru: '/app.php'
 
     # The size of the persistent disk of the application (in MB).
     disk: 2048
 
     # The mounts that will be performed when the package is deployed.
     mounts:
-        "/app/cache": "shared:files/cache"
-        "/app/logs": "shared:files/logs"
+        '/app/cache': 'shared:files/cache'
+        '/app/logs': 'shared:files/logs'
 
     # The hooks that will be performed when the package is deployed.
     hooks:
@@ -82,7 +82,7 @@ your Git repository which contains the following files:
     "http://{default}/":
         type: upstream
         # the first part should be your project name
-        upstream: "myphpproject:php"
+        upstream: 'myphpproject:php'
 
 .. code-block:: yaml