str_split不支持中文，利用mb_xx函数实现个

/** * Convert a string to an array * @param string $str * @param number $split_length * @return multitype:string */function mb_str_split($str,$split_length=1,$charset="UTF-8"){  if(func_num_args()==1){    return preg_split("/(?<!^)(?!$)/u", $str);  }  if($split_length<1)return false;  $len = mb_strlen($str, $charset);  $arr = array();  for($i=0;$i<$len;$i+=$split_length){    $s = mb_substr($str, $i, $split_length, $charset);    $arr[] = $s;  }  return $arr;}

方法二：

function mbStrSplit ($string, $len=1) {  $start = 0;  $strlen = mb_strlen($string);  while ($strlen) {    $array[] = mb_substr($string,$start,$len,"utf8");    $string = mb_substr($string, $len, $strlen,"utf8");    $strlen = mb_strlen($string);  }  return $array;}

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