How to implement a custom function in PHP to obtain the first letter of a Chinese character

This article mainly introduces the method of PHP custom function to obtain the first letter of Chinese characters, involving PHP coding conversion and judgment operation related techniques for Chinese characters. It is very simple and practical. Friends in need can refer to the following

Letters are important and can be used for sorting.

City list and more.

<?php
/*
* Created on 2016-12-1
*/
function getFirstCharter($str)
{
  if (empty($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;
}
$firstChar = getFirstCharter(&#39;脚本之家&#39;);
print_r($firstChar);//输出：J
?>

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