$countries = array( 'USA' => 'English', 'Spain' => 'Spanish',
'Brasil' => 'Portuguese', 'UK' => 'English',
'France' => 'French', 'Argentina' => 'Spanish');
$languages = array_unique($countries);
printf("%s
\n", var_export($languages, TRUE));
$languages = array_unique( array_values($countries) );
printf("%s
\n", var_export($languages, TRUE));
$languages = array_values( array_unique($countries) );
printf("%s
\n", var_export($languages, TRUE));
?>