PHP implements method of extracting Chinese and English initials

This article will share with you a simple method and example for extracting the first letters of Chinese and English characters using PHP. It is very useful. Friends in need can refer to it.

PHP implements obtaining Chinese and English according to the initials

/** 
  * 
  */ 
function getfirstchar($s0){ 
        if($s0[0]=='I' || $s[0]=='i'){ 
          return "I"; 
        }elseif($s0[0]=='U' || $s[0]=='u'){ 
          return 'U'; 
        }elseif($s0[0]=='V' || $s[0]=='v'){ 
          return 'V'; 
        }else{ 
  $fchar = ord($s0{0}); 
  if($fchar >= ord("A") and $fchar <= ord("z") )return strtoupper($s0{0}); 
  $s1 = iconv("UTF-8","gb2312", $s0); 
  $s2 = iconv("gb2312","UTF-8", $s1); 
  if($s2 == $s0){$s = $s1;}else{$s = $s0;} 
  $asc = ord($s{0}) * 256 + ord($s{1}) - 65536; 
  if($asc >= -20319 and $asc <= -20284) return "A"; 
  if($asc >= -20283 and $asc <= -19776) return "B"; 
  if($asc >= -19775 and $asc <= -19219) return "C"; 
  if($asc >= -19218 and $asc <= -18711) return "D"; 
  if($asc >= -18710 and $asc <= -18527) return "E"; 
  if($asc >= -18526 and $asc <= -18240) return "F"; 
  if($asc >= -18239 and $asc <= -17923) return "G"; 
  if($asc >= -17922 and $asc <= -17418) return "H"; 
  if($asc >= -17417 and $asc <= -16475) return "J"; 
  if($asc >= -16474 and $asc <= -16213) return "K"; 
  if($asc >= -16212 and $asc <= -15641) return "L"; 
  if($asc >= -15640 and $asc <= -15166) return "M"; 
  if($asc >= -15165 and $asc <= -14923) return "N"; 
  if($asc >= -14922 and $asc <= -14915) return "O"; 
  if($asc >= -14914 and $asc <= -14631) return "P"; 
  if($asc >= -14630 and $asc <= -14150) return "Q"; 
  if($asc >= -14149 and $asc <= -14091) return "R"; 
  if($asc >= -14090 and $asc <= -13319) return "S"; 
  if($asc >= -13318 and $asc <= -12839) return "T"; 
  if($asc >= -12838 and $asc <= -12557) return "W"; 
  if($asc >= -12556 and $asc <= -11848) return "X"; 
  if($asc >= -11847 and $asc <= -11056) return "Y"; 
  if($asc >= -11055 and $asc <= -10247) return "Z"; 
  return null; 
        } 
  }

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