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php取得漢字首字母且實現分組排序的案例分析

黄舟
黄舟原創
2017-10-23 09:03:551936瀏覽

前言

本文主要為大家介紹了關於PHP取得漢字首字母並分組排序的相關內容,因為經常我們在做專案的時候,會有按首字母排序的需求例如: 美團的城市選擇http://www.meituan.com/index/changecity/initiative app中按字母搜尋

正題

網路上找了各種,不盡人意,於是,自己就寫了一個,分享給大家。


<?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 = &#39;name&#39;)
 {
  $data = array_map(function ($item) use ($targetKey) {
   return array_merge($item, [
    &#39;initials&#39; => $this->getInitials($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[&#39;initials&#39;]][] = $value;
  }
  ksort($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 &#39;&#39;;}
  $fchar = ord($str{0});
  if ($fchar >= ord(&#39;A&#39;) && $fchar <= ord(&#39;z&#39;)) {
   return strtoupper($str{0});
  }

  $s1 = iconv(&#39;UTF-8&#39;, &#39;gb2312&#39;, $str);
  $s2 = iconv(&#39;gb2312&#39;, &#39;UTF-8&#39;, $s1);
  $s = $s2 == $str ? $s1 : $str;
  $asc = ord($s{0}) * 256 + ord($s{1}) - 65536;
  if ($asc >= -20319 && $asc <= -20284) {
   return &#39;A&#39;;
  }

  if ($asc >= -20283 && $asc <= -19776) {
   return &#39;B&#39;;
  }

  if ($asc >= -19775 && $asc <= -19219) {
   return &#39;C&#39;;
  }

  if ($asc >= -19218 && $asc <= -18711) {
   return &#39;D&#39;;
  }

  if ($asc >= -18710 && $asc <= -18527) {
   return &#39;E&#39;;
  }

  if ($asc >= -18526 && $asc <= -18240) {
   return &#39;F&#39;;
  }

  if ($asc >= -18239 && $asc <= -17923) {
   return &#39;G&#39;;
  }

  if ($asc >= -17922 && $asc <= -17418) {
   return &#39;H&#39;;
  }

  if ($asc >= -17417 && $asc <= -16475) {
   return &#39;J&#39;;
  }

  if ($asc >= -16474 && $asc <= -16213) {
   return &#39;K&#39;;
  }

  if ($asc >= -16212 && $asc <= -15641) {
   return &#39;L&#39;;
  }

  if ($asc >= -15640 && $asc <= -15166) {
   return &#39;M&#39;;
  }

  if ($asc >= -15165 && $asc <= -14923) {
   return &#39;N&#39;;
  }

  if ($asc >= -14922 && $asc <= -14915) {
   return &#39;O&#39;;
  }

  if ($asc >= -14914 && $asc <= -14631) {
   return &#39;P&#39;;
  }

  if ($asc >= -14630 && $asc <= -14150) {
   return &#39;Q&#39;;
  }

  if ($asc >= -14149 && $asc <= -14091) {
   return &#39;R&#39;;
  }

  if ($asc >= -14090 && $asc <= -13319) {
   return &#39;S&#39;;
  }

  if ($asc >= -13318 && $asc <= -12839) {
   return &#39;T&#39;;
  }

  if ($asc >= -12838 && $asc <= -12557) {
   return &#39;W&#39;;
  }

  if ($asc >= -12556 && $asc <= -11848) {
   return &#39;X&#39;;
  }

  if ($asc >= -11847 && $asc <= -11056) {
   return &#39;Y&#39;;
  }

  if ($asc >= -11055 && $asc <= -10247) {
   return &#39;Z&#39;;
  }

  return null;
 }

}

專案中直接引入即可,如果需要命名空間,可以自行添加,以下是我們看看怎麼用。


// 按首字母排序
$data = [
 [&#39;id&#39; => 1, &#39;area_name&#39; => &#39;山东&#39;],
 [&#39;id&#39; => 2, &#39;area_name&#39; => &#39;江苏&#39;],
 [&#39;id&#39; => 3, &#39;area_name&#39; => &#39;安徽&#39;],
 [&#39;id&#39; => 4, &#39;area_name&#39; => &#39;福建&#39;],
 [&#39;id&#39; => 5, &#39;area_name&#39; => &#39;江西&#39;],
 [&#39;id&#39; => 6, &#39;area_name&#39; => &#39;广东&#39;],
 [&#39;id&#39; => 7, &#39;area_name&#39; => &#39;广西&#39;],
 [&#39;id&#39; => 8, &#39;area_name&#39; => &#39;海南&#39;],
 [&#39;id&#39; => 9, &#39;area_name&#39; => &#39;河南&#39;],
 [&#39;id&#39; => 10, &#39;area_name&#39; => &#39;湖南&#39;],
 [&#39;id&#39; => 11, &#39;area_name&#39; => &#39;湖北&#39;],
];
// 初始化,然后调用分组方法
$data = (new Character)->groupByInitials($data, &#39;area_name&#39;);

下面的結果是不是你想要的呢,不論是做app還是網頁,都可以用


$data = array(
 &#39;A&#39; => array(
  0 => array(
   &#39;id&#39; => 3,
   &#39;area_name&#39; => &#39;安徽&#39;,
   &#39;initials&#39; => &#39;A&#39;
  )
 ) ,
 &#39;F&#39; => array(
  0 => array(
   &#39;id&#39; => 4,
   &#39;area_name&#39; => &#39;福建&#39;,
   &#39;initials&#39; => &#39;F&#39;
  )
 ) ,
 &#39;G&#39; => array(
  0 => array(
   &#39;id&#39; => 6,
   &#39;area_name&#39; => &#39;广东&#39;,
   &#39;initials&#39; => &#39;G&#39;
  ) ,
  1 => array(
   &#39;id&#39; => 7,
   &#39;area_name&#39; => &#39;广西&#39;,
   &#39;initials&#39; => &#39;G&#39;
  )
 ) ,
 &#39;H&#39; => array(
  0 => array(
   &#39;id&#39; => 8,
   &#39;area_name&#39; => &#39;海南&#39;,
   &#39;initials&#39; => &#39;H&#39;
  ) ,
  1 => array(
   &#39;id&#39; => 9,
   &#39;area_name&#39; => &#39;河南&#39;,
   &#39;initials&#39; => &#39;H&#39;
  ) ,
  2 => array(
   &#39;id&#39; => 10,
   &#39;area_name&#39; => &#39;湖南&#39;,
   &#39;initials&#39; => &#39;H&#39;
  ) ,
  3 => array(
   &#39;id&#39; => 11,
   &#39;area_name&#39; => &#39;湖北&#39;,
   &#39;initials&#39; => &#39;H&#39;
  )
 ) ,
 &#39;J&#39; => array(
  0 => array(
   &#39;id&#39; => 2,
   &#39;area_name&#39; => &#39;江苏&#39;,
   &#39;initials&#39; => &#39;J&#39;
  ) ,
  1 => array(
   &#39;id&#39; => 5,
   &#39;area_name&#39; => &#39;江西&#39;,
   &#39;initials&#39; => &#39;J&#39;
  )
 ) ,
 &#39;S&#39; => array(
  0 => array(
   &#39;id&#39; => 1,
   &#39;area_name&#39; => &#39;山东&#39;,
   &#39;initials&#39; => &#39;S&#39;
  )
 )
);

總結

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