小编use*_*430的帖子

我有以下代码不能使用UTF-8字符.我该如何解决？

$seed = preg_split('//u', $seed, -1, PREG_SPLIT_NO_EMPTY);
$seed = str_split('????????'); // and any other characters

shuffle($seed); // probably optional since array_is randomized; this may be redundant
$code = '';
foreach (array_rand($seed, 5) as $k) $md5_hash .= $seed[$k];

//We don't need a 32 character long string so we trim it down to 5 
$security_code = $code;

我试过这段代码:

$seed = preg_split('//u', $seed, -1, PREG_SPLIT_NO_EMPTY);

但它仍然无法正常工作.