php - 中文字符串分割

//先删除掉非中文的字体
$str = preg_replace('/[^\x{4e00}-\x{9fa5}]/u', '', $str);
//经过测试中文占3个篇幅
$re = chunk_split($str,3,",");
//再利用explode将字符串分割为数组
$re = explode(",",$re);