我正在尝试将utf8编码的字符串拆分为字符数组.我现在使用的功能用于工作,但由于某种原因它不再起作用.可能是什么原因.更好的是,我该如何解决？

这是我的字符串：

这是我的功能：

function utf8SplIT($str,$len = 1)
{
  $arr = array();
  $strlen = mb_strlen($str);
  for ($i = 0; $i < $strLen; $i++)
  {
    $arr[] = mb_substr($str,$i,$len);
  }
  return $arr;
}

这是结果：

Array
(
    [0] => Z
    [1] => e
    [2] => l
    [3] => f
    [4] =>  
    [5] => h
    [6] => e
    [7] => b
    [8] =>  
    [9] => i
    [10] => k
    [11] =>  
    [12] => m
    [13] => a
    [14] => a
    [15] => r
    [16] =>  
    [17] => e
    [18] => ́
    [19] => e
    [20] => ́
    [21] => n
    [22] =>  
    [23] => v
    [24] => r
    [25] => a
    [26] => a
    [27] => g
    [28] => :
    [29] =>  
    [30] => w
    [31] => i
    [32] => e
    [33] =>  
    [34] => b
    [35] => e
    [36] => n
    [37] =>  
    [38] => j
    [39] => i
    [40] => j
    [41] => ?
)

preg_split('//u',$str,null,PREG_SPLIT_NO_EMPTY);