I have this class in a UTF-8 encoded file called EnUTF8.Class.php:

class EnUTF8 {

    public function ñññ() {

        return 'ñññ()';

    }
}

and in another UTF-8 encoded file:

require_once('EnUTF8.Class.php');
require_once('OneBuggy.Class.php');

$utf8 = new EnUTF8();
//$buggy = new OneBuggy();

echo (method_exists($utf8, 'ñññ')) ? 'ñññ() exists!' : 'ñññ() does not exist...';

echo "\n\n----------------------------------\n\n"

print_r(get_class_methods($utf8));

echo "\n----------------------------------\n\n"

echo $utf8->ñññ();

that produces the expected result:

ñññ() exists!

----------------------------------

Array
(
    [0] => ñññ
)

----------------------------------

ñññ()

but if...

require_once('EnUTF8.Class.php');
require_once('OneBuggy.Class.php');

$utf8 = new EnUTF8();
$buggy = new OneBuggy();

echo (method_exists($utf8, 'ñññ')) ? 'ñññ() exists!' : 'ñññ() does not exist...';

echo "\n\n----------------------------------\n\n"

print_r(get_class_methods($utf8));

echo "\n----------------------------------\n\n"

echo $utf8->ñññ();

then the weirdness appears!!!:

ñññ() does not exist!

----------------------------------

Array
(
[0] => ñññ
)

----------------------------------

Fatal error: Call to undefined method EnUTF8::ñññ() in /var/www/test.php on line 16

Well, the thing is that OneBuggy.Class.php is UTF-8 encoded too and shares absolutly nothing with EnUTF8.Class.php so...

where is the bug?

UPDATED:

Well, after a long debugging time I found this in OneBuggy.Class.php constructor:

setlocale (LC_ALL, "es_ES@euro", "es_ES", "esp");

so I did...

//setlocale (LC_ALL, "es_ES@euro", "es_ES", "esp");

and now it works but why?.