php简单实现多字节字符串翻转的方法

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<?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;

}