Array con caracteres no ingleses

[fa2012]

Hola,
Llevo un buen rato intentando solucionar este problema pero no hay manera. Los caracteres rusos no se muestran correctamente.
¿Alguien tiene una solución que funcione?
Muchas gracias.



<?
header("Content-type: text/html; charset=UTF-8");

$letters = array('А','а','Б','б','В','в','Е','е','Ё','ё','Ж', 'ж','З','з','К','к','Л','л','М','м','Н','н','О','о ','П','п','Р','р','Д','д','Й','й','Г','г','С','с', 'У','у','Ф','ф','Х','х','Ц','ц','Ч','ч','Ш','ш','Щ ','щ','Ъ','ъ','Ы','ы','Ь','ь','Э','э','Ю','ю','Я', 'я','И','и','Т','т');

print_r($letters);
?>

======================

Esto es lo que veo al ejecutarlo:

Array ( [0] => ? [1] => ? [2] => ? [3] => ? [4] => ? [5] => ? [6] => ? [7] => ? [8] => ? [9] => ? [10] => ? [11] => ? [12] => ? [13] => ? [14] => ? [15] => ? [16] => ? [17] => ? [18] => ? [19] => ? [20] => ? [21] => ? [22] => ? [23] => ? [24] => ? [25] => ? [26] => ? [27] => ? [28] => ? [29] => ? [30] => ? [31] => ? [32] => ? [33] => ? [34] => ? [35] => ? [36] => ? [37] => ? [38] => ? [39] => ? [40] => ? [41] => ? [42] => ? [43] => ? [44] => ? [45] => ? [46] => ? [47] => ? [48] => ? [49] => ? [50] => ? [51] => ? [52] => ? [53] => ? [54] => ? [55] => ? [56] => ? [57] => ? [58] => ? [59] => ? [60] => ? [61] => ? [62] => ? [63] => ? [64] => ? [65] => ? )

[SirDuque]

El codigo fue testeado en Linux y funciona correctamente:
Resultado:

Array ( [0] => А [1] => а [2] => Б [3] => б [4] => В [5] => в [6] => Е [7] => е [8] => Ё [9] => ё [10] => Ж [11] => ж [12] => З [13] => з [14] => К [15] => к [16] => Л [17] => л [18] => М [19] => м [20] => Н [21] => н [22] => О [23] => о [24] => П [25] => п [26] => Р [27] => р [28] => Д [29] => д [30] => Й [31] => й [32] => Г [33] => г [34] => С [35] => с [36] => У [37] => у [38] => Ф [39] => ф [40] => Х [41] => х [42] => Ц [43] => ц [44] => Ч [45] => ч [46] => Ш [47] => ш [48] => Щ [49] => щ [50] => Ъ [51] => ъ [52] => Ы [53] => ы [54] => Ь [55] => ь [56] => Э [57] => э [58] => Ю [59] => ю [60] => Я [61] => я [62] => И [63] => и [64] => Т [65] => т )

[fa2012]

Hola,
Muchas gracias. Me puedes pasar las características del php que tienes instalado o el php.ini. Entonces tiene que ser ése el problema.
Un saludo.