I apologize for the confusion. Here's the PHP function you're looking for:

```php
function get_requestor_preferred_language() {
    $acceptedLanguages = ['es', 'de', 'en', 'fr', 'zh', 'jp'];
    $defaultLanguage = 'en';

    if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) {
        $languages = explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']);

        foreach ($languages as $language) {
            $langCode = substr($language, 0, 2);

            if (in_array($langCode, $acceptedLanguages)) {
                return $langCode;
            }
        }
    }

    return $defaultLanguage;
}
```

This function gets the user's preferred language from the HTTP_ACCEPT_LANGUAGE server variable, and returns one of the accepted languages or the default language ("en") if none of the accepted languages are found.
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