【PHP原生】获取字符串所有汉字首字母和首个汉字首字母

1、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)

?>