PHP获取汉字拼音首字母

<?php
/**
* @name: getfirstchar
* @description: 获取汉子首字母
* @param: string
* @return: mixed
* @author:
* @create: 2014-09-17 21:46:52
**/
function getfirstchar($s0){
$fchar = ord($s0{0});
if($fchar >= ord("A") and $fchar <= ord("z") )return strtoupper($s0{0});
//$s1 = iconv("UTF-8","gb2312//IGNORE", $s0);
// $s2 = iconv("gb2312","UTF-8//IGNORE", $s1);
$s1 = get_encoding($s0,'GB2312');
$s2 = get_encoding($s1,'UTF-8');
if($s2 == $s0){$s = $s1;}else{$s = $s0;}
$asc = ord($s{0}) * 256 + ord($s{1}) - 65536;
if($asc >= -20319 and $asc <= -20284) return "A";
if($asc >= -20283 and $asc <= -19776) return "B";
if($asc >= -19775 and $asc <= -19219) return "C";
if($asc >= -19218 and $asc <= -18711) return "D";
if($asc >= -18710 and $asc <= -18527) return "E";
if($asc >= -18526 and $asc <= -18240) return "F";
if($asc >= -18239 and $asc <= -17923) return "G";
if($asc >= -17922 and $asc <= -17418) return "I";
if($asc >= -17417 and $asc <= -16475) return "J";
if($asc >= -16474 and $asc <= -16213) return "K";
if($asc >= -16212 and $asc <= -15641) return "L";
if($asc >= -15640 and $asc <= -15166) return "M";
if($asc >= -15165 and $asc <= -14923) return "N";
if($asc >= -14922 and $asc <= -14915) return "O";
if($asc >= -14914 and $asc <= -14631) return "P";
if($asc >= -14630 and $asc <= -14150) return "Q";
if($asc >= -14149 and $asc <= -14091) return "R";
if($asc >= -14090 and $asc <= -13319) return "S";
if($asc >= -13318 and $asc <= -12839) return "T";
if($asc >= -12838 and $asc <= -12557) return "W";
if($asc >= -12556 and $asc <= -11848) return "X";
if($asc >= -11847 and $asc <= -11056) return "Y";
if($asc >= -11055 and $asc <= -10247) return "Z";
return null;
}
/**
* @name: get_encoding
* @description: 自动检测内容编码进行转换
* @param: string data
* @param: string to  目标编码
* @return: string
**/
function get_encoding($data,$to){
$encode_arr=array('UTF-8','ASCII','GBK','GB2312','BIG5','JIS','eucjp-win','sjis-win','EUC-JP');
$encoded=mb_detect_encoding($data, $encode_arr);
$data = mb_convert_encoding($data,$to,$encoded);
return $data;
}

function pinyin1($zh){
$ret = "";
$s1 = iconv("UTF-8","gb2312", $zh);
$s2 = iconv("gb2312","UTF-8", $s1);
if($s2 == $zh){$zh = $s1;}
for($i = 0; $i < strlen($zh); $i++){
$s1 = substr($zh,$i,1);
$p = ord($s1);
if($p > 160){
$s2 = substr($zh,$i++,2);
$ret .= getfirstchar($s2);
}else{
$ret .= $s1;
}
}
return $ret;
}
$str = '草你大爷';
echo pinyin1($str);

?>