前言
本文主要给大家介绍了关于PHP获取汉字首字母并分组排序的相关内容，因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 http://www.meituan.com/index/changecity/initiative app中按字母搜索
正题
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" ) ));
总结
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，如果有疑问大家可以留言交流，谢谢大家对网页设计的支持。
