[Translation] Adding PHPDoc to the MessageSelector::choose() method.

src/Symfony/Component/Translation/MessageSelector.php

@@ -18,6 +18,30 @@ namespace Symfony\Component\Translation;
  */
 class MessageSelector
 {
+    /**
+     * Given a message with different plural translations separated by a
+     * pipe (|), this method returns the correct portion of the message based
+     * on the given number, locale and the pluralization rules in the message
+     * itself.
+     *
+     * The message supports two different types of pluralization rules:
+     *
+     * interval: {0} There is no apples|{1} There is one apple|]1,Inf] There is %count% apples
+     * indexed:  There is one apple|There is %count% apples
+     *
+     * The indexed solution can also contain labels (e.g. one: There is one apple).
+     * This is purely for making the translations more clear - it does not
+     * affect the functionality.
+     *
+     * The two methods can also be mixed:
+     *     {0} There is no apples|one: There is one apple|more: There is %count% apples
+     *
+     * @throws InvalidArgumentException
+     * @param  string $message The message being translated
+     * @param  integer $number The number of items represented for the message
+     * @param  string $locale The locale to use for choosing
+     * @return string
+     */
     public function choose($message, $number, $locale)
     {
         $parts = explode('|', $message);