2022-06-24

PHP数组按汉字首字母排序

一、先取得数组中需要排序值的首字母

    //获取汉字首字母
    public function getFirstCharter($str)
    {
        if (empty($str)) {
            return '';
        }
        $fchar = ord($str{0});
        if ($fchar >= ord('A') && $fchar <= ord('z')) return strtoupper($str{0});
        $s1 = iconv('UTF-8', 'gb2312', $str);
        $s2 = iconv('gb2312', 'UTF-8', $s1);
        $s = $s2 == $str ? $s1 : $str;
        $asc = ord($s{0}) * 256 + ord($s{1}) - 65536;
        if ($asc >= -20319 && $asc <= -20284) return 'A';
        if ($asc >= -20283 && $asc <= -19776) return 'B';
        if ($asc >= -19775 && $asc <= -19219) return 'C';
        if ($asc >= -19218 && $asc <= -18711) return 'D';
        if ($asc >= -18710 && $asc <= -18527) return 'E';
        if ($asc >= -18526 && $asc <= -18240) return 'F';
        if ($asc >= -18239 && $asc <= -17923) return 'G';
        if ($asc >= -17922 && $asc <= -17418) return 'H';
        if ($asc >= -17417 && $asc <= -16475) return 'J';
        if ($asc >= -16474 && $asc <= -16213) return 'K';
        if ($asc >= -16212 && $asc <= -15641) return 'L';
        if ($asc >= -15640 && $asc <= -15166) return 'M';
        if ($asc >= -15165 && $asc <= -14923) return 'N';
        if ($asc >= -14922 && $asc <= -14915) return 'O';
        if ($asc >= -14914 && $asc <= -14631) return 'P';
        if ($asc >= -14630 && $asc <= -14150) return 'Q';
        if ($asc >= -14149 && $asc <= -14091) return 'R';
        if ($asc >= -14090 && $asc <= -13319) return 'S';
        if ($asc >= -13318 && $asc <= -12839) return 'T';
        if ($asc >= -12838 && $asc <= -12557) return 'W';
        if ($asc >= -12556 && $asc <= -11848) return 'X';
        if ($asc >= -11847 && $asc <= -11056) return 'Y';
        if ($asc >= -11055 && $asc <= -10247) return 'Z';
        return null;
    }

二、数组按需要的键值进行排序

    //数组按键排序
    public function array_sort($array, $on, $order = SORT_ASC)
    {
        $new_array = array();
        $sortable_array = array(); //保存key的数组
        if (count($array) > 0) {
            foreach ($array as $k => $v) {
                if (is_array($v)) {
                    foreach ($v as $k2 => $v2) {
                        if ($k2 == $on) {
                            $sortable_array[$k] = $v2;
                        }
                    }
                } else {
                    $sortable_array[$k] = $v;
                }
            }
            switch ($order) {
                case SORT_ASC:
                    asort($sortable_array);
                    break;

                case SORT_DESC:
                    arsort($sortable_array);
                    break;

            }
            foreach ($sortable_array as $k => $v) {
                $new_array[$k] = $array[$k];
            }
        }
        return $new_array;
    }

调用示例:

/将首字母做为数组的新键 zm
foreach($res as $key => $value) {
    $res[$key]['zm'] = $this->getFirstCharter($value['townName']);
}
$res=$this->array_sort($res,"zm");

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