PHP获取文字的英文的首字母 - php基础

php首页字母排序

function getfirstchar($s0){$s=iconv("UTF-8","gb2312", $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 false;

}

function getletter($title) {

if (ord($title)>128) { //汉字开头

$letter=getfirstchar($title);

} elseif(ord($title)>=48 and ord($title)<=57){ //数字开头

$letter=iconv_substr($title,0,1,'utf-8');

}elseif(ord($title)>=65 and ord($title)<=90){ //大写英文开头

$letter=iconv_substr($title,0,1,'utf-8');

}elseif(ord($title)>=97 and ord($title)<=122){ //小写英文开头

$letter=iconv_substr($title,0,1,'utf-8');

}

return $letter;

}