bug symfony#23575 [VarDumper] Use "C" locale when using "comma" flags (nicolas-grekas)

This PR was merged into the 3.3 branch.

Discussion
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[VarDumper] Use "C" locale when using "comma" flags

| Q             | A
| ------------- | ---
| Branch?       | 3.3
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#23572
| License       | MIT
| Doc PR        | -

Adding trailing comma implicitly requires a C locale.

Commits
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305ae5e [VarDumper] Use "C" locale when using "comma" flags

Author: fabpot

src/Symfony/Component/VarDumper/Dumper/AbstractDumper.php

@@ -123,6 +123,10 @@ public function setIndentPad($pad)
      */
     public function dump(Data $data, $output = null)
     {
+        if ($locale = $this->flags & (self::DUMP_COMMA_SEPARATOR | self::DUMP_TRAILING_COMMA) ? setlocale(LC_NUMERIC, 0) : null) {
+            setlocale(LC_NUMERIC, 'C');
+        }
+
         if ($returnDump = true === $output) {
             $output = fopen('php://memory', 'r+b');
         }
@@ -143,6 +147,9 @@ public function dump(Data $data, $output = null)
             if ($output) {
                 $this->setOutput($prevOutput);
             }
+            if ($locale) {
+                setlocale(LC_NUMERIC, $locale);
+            }
         }
     }