PHP chunk_split（）问题

When I use the chunk_split() function it ruins my accents characters and special characters and I was wondering how can I correct this problem?

Here is my PHP code.

if(count($text) > 0) {
    $text = implode(' ', $text);
    echo chunk_split($text, 8, '<br />'); 
}

Ruined accent characters.

&a mp; Post er ÀÁ� �ÃÄÅ� �áâã� �åÒÓ� �ÕÖØ� �óôõ� �øÈÉ� �Ëéè� �ëÇç� �ÍÎÏ� �íîï� �ÚÛÜ� �úûü� �Ññ

chunk_split isn't multibyte safe and there isn't a native mb_chunk_split.

http://php.net/manual/en/function.chunk-split.php

Here is a function to do that from a commenter in the php docs:

<?php

//from Peter from dezzignz.com 05-Apr-2010 11:30 @ php.net

function mbStringToArray ($str) {
    if (empty($str)) return false;
    $len = mb_strlen($str);
    $array = array();
    for ($i = 0; $i < $len; $i++) {
        $array[] = mb_substr($str, $i, 1);
    }
    return $array;
}

function mb_chunk_split($str, $len, $glue) {
    if (empty($str)) return false;
    $array = mbStringToArray ($str);
    $n = 0;
    $new = '';
    foreach ($array as $char) {
        if ($n < $len) $new .= $char;
        elseif ($n == $len) {
            $new .= $glue . $char;
            $n = 0;
        }
        $n++;
    }
    return $new;
}

?>

Try converting the character set before and after as seen here:

http://us3.php.net/manual/en/function.chunk-split.php#99316