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php实现获取中英文按照首字母
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/**
*
*/
function getfirstchar($s0){
if($s0[0]=='i' || $s[0]=='i'){
return "i";
}elseif($s0[0]=='u' || $s[0]=='u'){
return 'u';
}elseif($s0[0]=='v' || $s[0]=='v'){
return 'v';
}else{
$fchar = ord($s0{0});
if($fchar >= ord("a") and $fchar <= ord("z") )return strtoupper($s0{0});
$s1 = iconv("utf-8","gb2312", $s0);
$s2 = iconv("gb2312","utf-8", $s1);
if($s2 == $s0){$s = $s1;}else{$s = $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 null;
}
}
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