PHP获取字符串首字母音序

```php
//获取英文或中文首字母大写
public function getCapital($s0)
{
    $fchar = ord(mb_substr($s0,0,1));
    if($fchar >= ord("A") and $fchar <= ord("z") )return strtoupper($s0{0});
    //通过两种字符集编码转换的对比，判断字符串是哪种字符集
    //最终取字符串为gb的字符集
    $s1 = iconv("UTF-8","gb2312", $s0);
    $s2 = iconv("gb2312","UTF-8", $s1);
    $s  = $s2 == $s0?$s1:$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;
}
```

指定字段对二维数组里的数据进行排序

树莓派系统

0人点赞