How to get the first letter of Chinese characters using PHP custom function

The example of this article describes the method of obtaining the first letter of Chinese characters by PHP custom function. Share it with everyone for your reference. The details are as follows: The first letter of

is very important and can be used in 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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