PHP按字符串长度分割成数组,支持中文

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/**
* 将unicode字符串按传入长度分割成数组
* @param  string  $str 传入字符串
* @param  integer $l   字符串长度
* @return mixed      数组或false
*/
function str_split_unicode($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);
}

<?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 )