[PHP知识库]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});

$s1=iconv{(}^{\prime }UTF?8^{\prime }{,}^{\prime }gb2312^{\prime },$str);

$s2=iconv{(}^{\prime }gb2312^{\prime }{,}^{\prime }UTF?8^{\prime },$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;

}