php简单的多字节字符串翻转
<?php
function mb_strev ($string, $encoding = null) {
if ($encoding === null) {
$encoding = mb_detect_encoding($string);
}
$length = mb_strlen($string, $encoding);
$reversed = '';
while($length-- > 0) {
$reversed .= mb_substring($string, $length, 1, $encoding);
}
return $reversed;
}
