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<?php

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;

}

header('Content-type:text/html;charset=utf-8');

$str = '我爱北京3我爱上海-我爱xianggang';

$r = mbStrSplit($str, 4);

echo '<pre>';

print_r($r);

echo '</pre>';

?>

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Array

(

  [0] => 我爱北京

  [1] => 3我爱上

  [2] => 海-我爱

  [3] => xian

  [4] => ggan

  [5] => g

)

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<?php

 function str_split_unicode($str, $l = 0) {

 if ($l > 0) {

 $ret = array();

 $len = mb_strlen($str,"UTF-8");

 for ($i = 0; $i < $len; $i += $l) {

 $ret[] = mb_substr($str, $i, $l,"UTF-8");

}

 return $ret;

}

 return preg_split("//u", $str, -1, PREG_SPLIT_NO_EMPTY);

}

?>

 $s ="还未如愿sss见gfg者不rtret不朽"; // Mild milk

 print_r(str_split($s, 5));

 print_r(str_split_unicode($s, 5));

//输出

 //Array ( [0] => 还�� [1] => �如� [2] => ��sss [3] => 见gf [4] => g者� [5] => ��rtr [6] => et不 [7] => 朽 )

 //Array ( [0] => 还未如愿s [1] => ss见gf [2] => g者不rt [3] => ret不朽 )