PHP获取中文拼音首字符方法

<?php
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", $s1);
	if ($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 $asc <= -17418)
		return "H";
	if ($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;
}

function firstPinyin($zh) {
	$ret = "";
	$s1 = iconv('UTF-8', 'GB2312//ignore', $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 {
			$ret .= strtoupper($s1);
		}
	}
	return strtoupper($ret);
	$ret = '';
}