//汉字字符转数组
function chStrToArray($str){
$length = mb_strlen($str, ‘utf-8‘);
$array = array();
for ($i=0; $i<$length; $i++)
$array[] = mb_substr($str, $i, 1, ‘utf-8‘);
return $array;
}
原文：https://www.cnblogs.com/KillBugMe/p/13151753.html