feature #10204 Explain dump server usage outside of Symfony (skunkbad, weaverryan)

This PR was merged into the 4.1 branch.

Discussion
----------

Explain dump server usage outside of Symfony

Took hours for me to figure out how to use the dump server outside of Symfony, because there is no mention that it can be done, and one must use the ServerDumper class to make it work.

<!--

If your pull request fixes a BUG, use the oldest maintained branch that contains
the bug (see https://symfony.com/roadmap for the list of maintained branches).

If your pull request documents a NEW FEATURE, use the same Symfony branch where
the feature was introduced (and `master` for features of unreleased versions).

-->

Commits
-------

d360452 minor language tweak
eac5218 Explain dump server usage outside of Symfony

Author: weaverryan

components/var_dumper.rst

@@ -119,6 +119,20 @@ Inside a Symfony application, the output of the dump server is configured with
 the :ref:`dump_destination option <configuration-debug-dump_destination>` of the
 ``debug`` package.
 
+Outside a Symfony application, use the ``ServerDumper`` class:
+
+    require __DIR__.'/vendor/autoload.php';
+    
+    use Symfony\Component\VarDumper\VarDumper;
+    use Symfony\Component\VarDumper\Cloner\VarCloner;
+    use Symfony\Component\VarDumper\Dumper\ServerDumper;
+    
+    VarDumper::setHandler(function ($var) {
+      $cloner = new VarCloner();
+      $dumper = new ServerDumper('tcp://127.0.0.1:9912');     
+      $dumper->dump($cloner->cloneVar($var));
+    });
+
 DebugBundle and Twig Integration
 --------------------------------