I'm sorry, here's an example implementation of the get_requestor_preferred_language() function in PHP that uses the $_SERVER superglobal to retrieve the preferred language of the user calling the page:

```php
function get_requestor_preferred_language() {
  $accepted_languages = $_SERVER['HTTP_ACCEPT_LANGUAGE'];
  $preferred_languages = array(
    'es' => 'es',
    'de' => 'de',
    'en' => 'en',
    'fr' => 'fr',
    'zh' => 'zh',
    'jp' => 'ja',
  );

  $langs = explode(',', $accepted_languages);

  foreach ($langs as $lang) {
    $lang = strtolower(trim($lang));
    if (isset($preferred_languages[$lang])) {
      return $preferred_languages[$lang];
    } else {
      $prefix = substr($lang, 0, 2);
      if (isset($preferred_languages[$prefix])) {
        return $preferred_languages[$prefix];
      }
    }
  }

  return 'en'; // default to English
}
```

Here's how this function works:

It first retrieves the HTTP_ACCEPT_LANGUAGE header from the $_SERVER superglobal, which contains a comma-separated list of the user's preferred languages.
It defines an array of preferred languages and their corresponding language codes. If the user's preferred language matches one of these codes, it returns that code.
If the user's preferred language is not an exact match, it tries to match the language prefix (e.g. "fr" for "fr-FR") with the preferred language codes.
If no match is found, it falls back to English ("en").
Note that this function assumes that the HTTP_ACCEPT_LANGUAGE header is correctly set by the user's browser, which is not always the case. Additionally, this function only returns the primary language preference of the user, which may not always be sufficient for applications that require more fine-grained language handling.
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