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匹配关键词

技术文档
04/08/2013

1、匹配关键词
$info="关于php的学习,我们首先要从最基本的php函数学起.";
$tagexp=array('php','jsp','python','php知识','php技术');
foreach($tagexp as $k=>$v){
//echo $v;die;
$tagstr .= '<a href="http://www.chinaigns.cn/invest/search-htm-kw-’.$v.’.html">’.$v.’</a>  ';
$pos=strpos($info,$v);
if($pos){
$info =substr_replace($info,"<a href=http://www.chinaigns.cn/invest/search-htm-kw-".$v.".html target=_blank >".$v."</a>",$pos,strlen($v));
}
}
echo $info;
?>
//strpos() 函数返回字符串在另一个字符串中第一次出现的位置。
//substr_replace() 函数把字符串的一部分替换为另一个字符串s

2、获取汉字拼音首字母
function getfirstchar($s0){
$firstchar_ord=ord(strtoupper($s0{0}));
if (($firstchar_ord>=65 and $firstchar_ord<=91)or($firstchar_ord>=48 and $firstchar_ord<=57)) return $s0{0};
$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 null;
}

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