php支持中文字符串分割的函数

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/**

* 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;

}

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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;

}