利用PHP获取汉字首字母并且分组排序详解

php;"><?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; }}

// 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');

$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'  ) ));