php获取汉字首字母方法

function getFirstCharter($str){

if(empty($str)){return ‘’;}

$fchar=ord($str{0});

if(KaTeX parse error: Expected 'EOF', got '&' at position 16: fchar>=ord('A')&̲&fchar<=ord(‘z’)) return strtoupper($str{0});

s 1 = i c o n v ( ′ U T F − 8 ′ , ′ g b 231 2 ′ , s1=iconv('UTF-8','gb2312', s1=iconv(′UTF−8′,′gb2312′,str);

s 2 = i c o n v ( ′ g b 231 2 ′ , ′ U T F − 8 ′ , s2=iconv('gb2312','UTF-8', s2=iconv(′gb2312′,′UTF−8′,s1);

$s=$s2==$str?$s1:$str;

$asc=ord($s{0})*256+ord($s{1})-65536;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-20319&̲&asc<=-20284) return ‘A’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-20283&̲&asc<=-19776) return ‘B’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-19775&̲&asc<=-19219) return ‘C’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-19218&̲&asc<=-18711) return ‘D’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-18710&̲&asc<=-18527) return ‘E’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-18526&̲&asc<=-18240) return ‘F’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-18239&̲&asc<=-17923) return ‘G’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-17922&̲&asc<=-17418) return ‘H’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-17417&̲&asc<=-16475) return ‘J’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-16474&̲&asc<=-16213) return ‘K’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-16212&̲&asc<=-15641) return ‘L’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-15640&̲&asc<=-15166) return ‘M’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-15165&̲&asc<=-14923) return ‘N’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-14922&̲&asc<=-14915) return ‘O’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-14914&̲&asc<=-14631) return ‘P’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-14630&̲&asc<=-14150) return ‘Q’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-14149&̲&asc<=-14091) return ‘R’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-14090&̲&asc<=-13319) return ‘S’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-13318&̲&asc<=-12839) return ‘T’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-12838&̲&asc<=-12557) return ‘W’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-12556&̲&asc<=-11848) return ‘X’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-11847&̲&asc<=-11056) return ‘Y’;

if(KaTeX parse error: Expected 'EOF', got '&' at position 12: asc>=-11055&̲&asc<=-10247) return ‘Z’;

return null;

}

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