PHP获取汉字首字母并分组排序

经常我们在做项目的时候，会有按首字母排序的需求 比如： 美团的城市选择

网上找了各种，不尽人意，于是，自己就写了一个，分享给大家。

<?php

/**
 * @author Tech
 */
class Character
{
    /**
     * 二维数组根据首字母分组排序
     * @param  array  $data      二维数组
     * @param  string $targetKey 首字母的键名
     * @return array             根据首字母关联的二维数组
     */
    public function groupByInitials(array $data, $targetKey = 'name')
    {
        $data = array_map(function ($item) use ($targetKey) {
            return array_merge($item, [
                'initials' => $this->getInitials($item[$targetKey]),
            ]);
        }, $data);
        $data = $this->sortInitials($data);
        return $data;
    }

    /**
     * 按字母排序
     * @param  array  $data
     * @return array
     */
    public function sortInitials(array $data)
    {
        $sortData = [];
        foreach ($data as $key => $value) {
            $sortData[$value['initials']][] = $value;
        }
        ksort($sortData);
        return $sortData;
    }
    
    /**
     * 获取首字母
     * @param  string $str 汉字字符串
     * @return string 首字母
     */
    public function getInitials($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;
    }

}

项目中直接引入即可，如果需要命名空间，可以自行添加，下面是我们看看怎么用。

// 按首字母排序
$data = [
    ['id' => 1, 'area_name' => '山东'],
    ['id' => 2, 'area_name' => '江苏'],
    ['id' => 3, 'area_name' => '安徽'],
    ['id' => 4, 'area_name' => '福建'],
    ['id' => 5, 'area_name' => '江西'],
    ['id' => 6, 'area_name' => '广东'],
    ['id' => 7, 'area_name' => '广西'],
    ['id' => 8, 'area_name' => '海南'],
    ['id' => 9, 'area_name' => '河南'],
    ['id' => 10, 'area_name' => '湖南'],
    ['id' => 11, 'area_name' => '湖北'],
];
// 初始化，然后调用分组方法
$data = (new Character)->groupByInitials($data, 'area_name');

下面的结果是不是你想要的呢，不论是做app还是网页，都可以用

$data = array(
    'A' => array(
        0 => array(
            'id' => 3,
            'area_name' => '安徽',
            'initials' => 'A'
        )
    ) ,
    'F' => array(
        0 => array(
            'id' => 4,
            'area_name' => '福建',
            'initials' => 'F'
        )
    ) ,
    'G' => array(
        0 => array(
            'id' => 6,
            'area_name' => '广东',
            'initials' => 'G'
        ) ,
        1 => array(
            'id' => 7,
            'area_name' => '广西',
            'initials' => 'G'
        )
    ) ,
    'H' => array(
        0 => array(
            'id' => 8,
            'area_name' => '海南',
            'initials' => 'H'
        ) ,
        1 => array(
            'id' => 9,
            'area_name' => '河南',
            'initials' => 'H'
        ) ,
        2 => array(
            'id' => 10,
            'area_name' => '湖南',
            'initials' => 'H'
        ) ,
        3 => array(
            'id' => 11,
            'area_name' => '湖北',
            'initials' => 'H'
        )
    ) ,
    'J' => array(
        0 => array(
            'id' => 2,
            'area_name' => '江苏',
            'initials' => 'J'
        ) ,
        1 => array(
            'id' => 5,
            'area_name' => '江西',
            'initials' => 'J'
        )
    ) ,
    'S' => array(
        0 => array(
            'id' => 1,
            'area_name' => '山东',
            'initials' => 'S'
        )
    )
);