php中文首字母转拼音

function getfirstchar($s0) {
$fchar = ord(substr($s0, 0, 1));
if (($fchar >= ord("a") and $fchar <= ord("z"))or($fchar >= ord("A") and $fchar <= ord("Z"))) return strtoupper(chr($fchar));
$s = iconv("UTF-8","gb2312", $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;
}