PHP常用函数之获取汉字首字母功能示例

Shun

这篇文章主要介绍了PHP常用函数之获取汉字首字母功能,结合实例形式分析了php汉字编码转换、截取、计算等相关操作技巧,需要的朋友可以参考下
本文实例讲述了PHP常用函数之获取汉字首字母功能。分享给大家供大家参考，具体如下：

//获取汉字的首字母
function getFirstCharters($str)
{
  if (empty($str)) {
  return '';
  }
  //取出参数字符串中的首个字符
  $temp_str = substr($str,0,1);
  if(ord($temp_str) > 127){
  $str = substr($str,0,3);
  }else{
  $str = $temp_str;
  $fchar = ord($str{0});
  if ($fchar >= ord('A') && $fchar <= ord('z')){
    return strtoupper($temp_str);
  }else{
    return null;
  }
  }
  $s1 = iconv('UTF-8', 'gb2312//IGNORE', $str);
  if(empty($s1)){
  return null;
  }
  $s2 = iconv('gb2312', 'UTF-8', $s1);
  if(empty($s2)){
  return null;
  }
  $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 && $asc <= -10247)
  return 'Z';
  return rare_words($asc);
}
//百家姓中的生僻字
function rare_words($asc=''){
  $rare_arr = array(
  -3652=>array('word'=>"窦",'first_char'=>'D'),
  -8503=>array('word'=>"奚",'first_char'=>'X'),
  -9286=>array('word'=>"酆",'first_char'=>'F'),
  -7761=>array('word'=>"岑",'first_char'=>'C'),
  -5128=>array('word'=>"滕",'first_char'=>'T'),
  -9479=>array('word'=>"邬",'first_char'=>'W'),
  -5456=>array('word'=>"臧",'first_char'=>'Z'),
  -7223=>array('word'=>"闵",'first_char'=>'M'),
  -2877=>array('word'=>"裘",'first_char'=>'Q'),
  -6191=>array('word'=>"缪",'first_char'=>'M'),
  -5414=>array('word'=>"贲",'first_char'=>'B'),
  -4102=>array('word'=>"嵇",'first_char'=>'J'),
  -8969=>array('word'=>"荀",'first_char'=>'X'),
  -4938=>array('word'=>"於",'first_char'=>'Y'),
  -9017=>array('word'=>"芮",'first_char'=>'R'),
  -2848=>array('word'=>"羿",'first_char'=>'Y'),
  -9477=>array('word'=>"邴",'first_char'=>'B'),
  -9485=>array('word'=>"隗",'first_char'=>'K'),
  -6731=>array('word'=>"宓",'first_char'=>'M'),
  -9299=>array('word'=>"郗",'first_char'=>'X'),
  -5905=>array('word'=>"栾",'first_char'=>'L'),
  -4393=>array('word'=>"钭",'first_char'=>'T'),
  -9300=>array('word'=>"郜",'first_char'=>'G'),
  -8706=>array('word'=>"蔺",'first_char'=>'L'),
  -3613=>array('word'=>"胥",'first_char'=>'X'),
  -8777=>array('word'=>"莘",'first_char'=>'S'),
  -6708=>array('word'=>"逄",'first_char'=>'P'),
  -9302=>array('word'=>"郦",'first_char'=>'L'),
  -5965=>array('word'=>"璩",'first_char'=>'Q'),
  -6745=>array('word'=>"濮",'first_char'=>'P'),
  -4888=>array('word'=>"扈",'first_char'=>'H'),
  -9309=>array('word'=>"郏",'first_char'=>'J'),
  -5428=>array('word'=>"晏",'first_char'=>'Y'),
  -2849=>array('word'=>"暨",'first_char'=>'J'),
  -7206=>array('word'=>"阙",'first_char'=>'Q'),
  -4945=>array('word'=>"殳",'first_char'=>'S'),
  -9753=>array('word'=>"夔",'first_char'=>'K'),
  -10041=>array('word'=>"厍",'first_char'=>'S'),
  -5429=>array('word'=>"晁",'first_char'=>'C'),
  -2396=>array('word'=>"訾",'first_char'=>'Z'),
  -7205=>array('word'=>"阚",'first_char'=>'K'),
  -10049=>array('word'=>"乜",'first_char'=>'N'),
  -10015=>array('word'=>"蒯",'first_char'=>'K'),
  -3133=>array('word'=>"竺",'first_char'=>'Z'),
  -6698=>array('word'=>"逯",'first_char'=>'L'),
  -9799=>array('word'=>"俟",'first_char'=>'Q'),
  -6749=>array('word'=>"澹",'first_char'=>'T'),
  -7220=>array('word'=>"闾",'first_char'=>'L'),
  -10047=>array('word'=>"亓",'first_char'=>'Q'),
  -10005=>array('word'=>"仉",'first_char'=>'Z'),
  -3417=>array('word'=>"颛",'first_char'=>'Z'),
  -6431=>array('word'=>"驷",'first_char'=>'S'),
  -7226=>array('word'=>"闫",'first_char'=>'Y'),
  -9293=>array('word'=>"鄢",'first_char'=>'Y'),
  -6205=>array('word'=>"缑",'first_char'=>'G'),
  -9764=>array('word'=>"佘",'first_char'=>'S'),
  -9818=>array('word'=>"佴",'first_char'=>'N'),
  -9509=>array('word'=>"谯",'first_char'=>'Q'),
  -3122=>array('word'=>"笪",'first_char'=>'D'),
  -9823=>array('word'=>"佟",'first_char'=>'T'),
  );
  if(array_key_exists($asc, $rare_arr) && $rare_arr[$asc]['first_char']){
  return $rare_arr[$asc]['first_char'] ;
  }else{
  return null;
  }
}
//测试：
echo getFirstCharters('窦');

运行结果：D希望本文所述对大家PHP程序设计有所帮助。
原文链接：https://www.cnblogs.com/gyfluck/p/8521259.html