解析PHP获取标题的拼音首字母（附代码示例）

本篇文章给大家带来了关于php的相关知识，其中主要跟大家介绍php怎么获取标题的拼音首字母，有代码示例，感兴趣的朋友下面一起来看一下吧，希望对大家有帮助。

获取标题的拼音首字母

这里需要注意的是 x 的 ascii 值的区间，有可能会出现判断为空的情况，已做修改。

一、通过计算 ascii 码值对比字母的 ascii 码值得出。

public function getfirstchar($s0)
{
    $fchar = ord($s0{0});
    if($fchar >= ord("A") and $fchar <= ord("z") ) return strtoupper($s0{0});
    $s1 = mb_convert_encoding($s0,"GBK","UTF-8");//iconv("UTF-8","GBK", $s0);
    $s2 = mb_convert_encoding($s1,"UTF-8","GBK");//iconv("GBK","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 >= -22605 and $asc <= -11848) return "x";
    if($asc >= -11847 and $asc <= -11056) return "y";
    if($asc >= -11055 and $asc <= -10247) return "z";
    return NULL;
}

二。获取整个标题的拼音首字母

public function pinyin_long($zh)
{
    $ret = "";
    if(empty($zh))
    {
        $ret="x";
    }else{
        $s1 = mb_convert_encoding($zh,"GBK","UTF-8");
        $s2 = mb_convert_encoding($s1,"UTF-8","GBK");
        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 .= $this->getfirstchar($s2);
            }else{
                $ret .= $s1;
            }
        }
    }
    return $ret;
}