bug #25662 Dumper shouldn't use html format for phpdbg / cli-server (jhoff)

This PR was submitted for the 3.3 branch but it was merged into the 2.7 branch instead (closes #25662).

Discussion
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Dumper shouldn't use html format for phpdbg / cli-server

| Q             | A
| ------------- | ---
| Branch?       | 3.3
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

This may not be the lowest branch that this fix applies to.

Prevents the dumper from outputting in html format when using phpdbg.

Commits
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e2b6091 Dumper shouldn't use html format for phpdbg

src/Symfony/Component/VarDumper/VarDumper.php

@@ -29,7 +29,7 @@ class VarDumper
     {
         if (null === self::$handler) {
             $cloner = new VarCloner();
-            $dumper = 'cli' === PHP_SAPI ? new CliDumper() : new HtmlDumper();
+            $dumper = in_array(PHP_SAPI, array('cli', 'phpdbg')) ? new CliDumper() : new HtmlDumper();
             self::$handler = function ($var) use ($cloner, $dumper) {
                 $dumper->dump($cloner->cloneVar($var));
             };