PHP Gets the function of the first letter of Chinese pinyin (really can be used

In reality we often see such a description, ranked in the first alphabetical order. This is the sort of method most Chinese use. So how do you do it in a PHP program? The following to share in the PHP program to obtain the first letter of Chinese pinyin, the most of the online search is problematic, this is the author of practical application, really can use OH.

PHP gets Chinese character phonetic initials function Getfirstcharter ($STR) {if (empty ($STR)) {return ';}
	$fchar =ord ($str {0});
	if ($fchar >=ord (' A ') && $fchar <=ord (' z ')) return Strtoupper ($str {0});
	$s 1=iconv (' UTF-8 ', ' gb2312 ', $str);
	$s 2=iconv (' gb2312 ', ' UTF-8 ', $s 1);
	$s = $s 2== $str? $s 1: $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 null; }

Examples are as follows:

echo getfirstcharter (' Programmer www.Alixixi.com ');//Result output: C