废话不多说，看代码，获取字符串汉字首字母，兼容GBK和UTF-8

<?php//获取单个汉字拼音首字母。注意:此处不要纠结。汉字拼音是没有以U和V开头的function getfirstchar($s0){  
   $fchar = ord($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 $asc <= -17418) return "H";    if($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;    //return $s0;}function pinyin_long($zh){  //获取整条字符串所有汉字拼音首字母
   $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 pinyin_long('*《，@#$123HAHadf一年后而已');echo "<br>";//console(*@#$123HAHadfYNHEY)function pinyin_long2($zh){  //获取整条字符串（非纯汉字链）首个汉字拼音首字母
   $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 pinyin_long2('*《，@#$123HAHadf一年后而已');//console(Y)?>