用PHP提取中英文词语以及数字的首字母的方法介绍

2020-03-22 17:16:09

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最近项目有个需求，在一个中英文（包括阿拉伯数字0-9）的海量词库中，提取每一个词语的首字母：gannicus—— G自由自在—— Z2B—— E傻X—— S
复制代码代码如下:
private function getfirstchar($s0){
$s=iconv('UTF-8','gb2312', $s0);
if (ord($s0) 128) { //汉字开头
$asc=ord($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 $asc =-17418)return "I";
if($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 $asc =-10247)return "Z";
}else if(ord($s) =48 and ord($s) =57){ //数字开头
switch(iconv_substr($s,0,1,'utf-8'))
{
case 1:return "Y";
case 2:return "E";
case 3:return "S";
case 4:return "S";
case 5:return "W";
case 6:return "L";
case 7:return "Q";
case 8:return "B";
case 9:return "J";
case 0:return "L";
}
}else if(ord($s) =65 and ord($s) =90){ //大写英文开头
return substr($s,0,1);
}else if(ord($s) =97 and ord($s) =122){ //小写英文开头
return strtoupper(substr($s,0,1));
}
else
{
return iconv_substr($s0,0,1,'utf-8');//中英混合的词语，不适合上面的各种情况，因此直接提取首个字符即可
}

}

遗留问题：仍有少量词语无法提取，如亘古不灭，的G 没有提取出来最终效果如图：PHP教程

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