function getFirstChar($s0)
{
    //ord() 函数返回字符串的首个字符的 ASCII 值
    $fchar = ord($s0{0});
    if ($fchar >= ord("A") and $fchar <= ord("z")) return strtoupper($s0{0});
    $s1 = iconv("UTF-8", "gb2312", $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 $asc <= -17418) return "I";
    if ($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;
}

function chinesePhoneticize($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;
}

echo "这是中文字符串<br/>";
echo pinyin1('这是中文字符串');