支持中文的PHP按字符串长度分割成数组代码

Array
(
  [0] => 我爱北京
  [1] => 3我爱上
  [2] => 海-我爱
  [3] => xian
  [4] => ggan
  [5] => g
)

<?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 )