PHP function to remove the first letter of a string (including Chinese characters)

//Get the first letter function

function getfirstchar($s0){
if(ord($s0)>="1" and ord($s0)<=ord("z") ) { return strtoupper($s0); }
//$s=iconv("UTF-8", "gb2312", $s0); If you need to convert to utf-8
$s=$s0;//No need Conversion situation
$asc=ord($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>=-16212 and $asc<=-15641)return "L"; -15165 and $asc<=-14923)return "N"; < = -14631) Return "P";
IF ($ ASC & GT; = -14630 and $ ASC & LT; = -14150) Return "q";
if ($ asc & gt; =-14149 and $ asc & lt; =-1409111140911 ) Return " R"; "        
if( $asc>=-12838 and $asc<=-12557)return "W"; 847 and $asc<=-11056)return "Y";
if($asc>=-11055 and $asc<=-10247)return "Z"; ;

?>

The above introduces the PHP function for extracting the first letter of a string (including Chinese characters), including the relevant content. I hope it will be helpful to friends who are interested in PHP tutorials.