PHP常用函数之获取汉字首字母功能示例

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

ps：这里再为大家提供几款本站拼音与字母相关工具供大家参考：

在线中英文根据首字母排序工具：

在线汉字转换成拼音工具：

在线中文汉字转拼音工具：

在线中文汉字拼音对照转换工具：

在线字母大小写转换工具：