Case study on obtaining the first letters of Chinese characters in php and implementing grouping sorting

Preface

This article mainly introduces to you the relevant content about PHP obtaining the first letters of Chinese characters and sorting them into groups, because often when we are doing projects, there will be For example, the requirement for alphabetical ordering is: Meituan’s city selection http://www.meituan.com/index/changecity/initiative app searches by letters

正名

#I found various ones online, but they were not satisfactory, so I wrote one myself and shared it with everyone.

<?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;
 }

}

It can be introduced directly into the project. If you need a namespace, you can add it yourself. Let’s see how to use it below.

// 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');

Is the following result what you want? You can use it whether you are making an app or a web page

$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'
  )
 )
);

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