从网站(wiki 文章)中提取关键字时遇到问题,提取的关键字并不完全是关键字,是从 html 中提取的词,而不是从网站中提取的词。
我使用以下代码:
include("Extkeys.php");
[...]
if (empty($keywords)){
$ekeywords = new KeyPer;
$keywords = $ekeywords->Keys($webhtml);
}
“Extkeys”的代码是:
<?php
class Extkeys {
function Keys($webhtml) {
$webhtml = $this->clean($webhtml);
$blacklist='de,la,los,las,el,ella,nosotros,yo,tu,el,te,mi,del,ellos';
$sticklist='test';
$minlength = 3;
$count = 17;
$webhtml = preg_replace('/[\.;:|\'|\"|\`|\,|\(|\)|\-]/', ' ', $webhtml);
$webhtml = preg_replace('/¡/', '', $webhtml);
$webhtml = preg_replace('/¿/', '', $webhtml);
$keysArray = explode(" ", $webhtml);
$keysArray = array_count_values(array_map('strtolower', $keysArray));
$blackArray = explode(",", $blacklist);
foreach($blackArray as $blackWord){
if(isset($keysArray[trim($blackWord)]))
unset($keysArray[trim($blackWord)]);
}
arsort($keysArray);
$i = 1;
$keywords = "";
foreach($keysArray as $word => $instances){
if($i > $count) break;
if(strlen(trim($word)) >= $minlength && is_string($word)) {
$keywords .= $word . ", ";
$i++;
}
}
$keywords = rtrim($keywords, ", ");
return $keywords=$sticklist.''.$keywords;
}
function clean($webhtml) {
$regex = '/(([_A-Za-z0-9-]+)(\\.[_A-Za-z0-9-]+)*@([A-Za-z0-9-]+)(\\.[A-Za-z0-9-]+)*)/iex';
$desc = preg_replace($regex, '', $webhtml);
$webhtml = preg_replace( "''si", '', $webhtml );
$webhtml = preg_replace( '/]*>([^<]+)<\/a>/is', '\2 (\1)', $webhtml );
$webhtml = preg_replace( '//', '', $webhtml );
$webhtml = preg_replace( '/{.+?}/', '', $webhtml );
$webhtml = preg_replace( '/ /', ' ', $webhtml );
$webhtml = preg_replace( '/&/', ' ', $webhtml );
$webhtml = preg_replace( '/"/', ' ', $webhtml );
$webhtml = strip_tags( $webhtml );
$webhtml = htmlspecialchars($webhtml);
$webhtml = str_replace(array("\r\n", "\r", "\n", "\t"), " ", $webhtml);
while (strchr($webhtml," ")) {
$webhtml = str_replace(" ", "",$webhtml);
}
for ($cnt = 1;
$cnt < strlen($webhtml)-1; $cnt++) {
if (($webhtml{$cnt} == '.') || ($webhtml{$cnt} == ',')) {
if ($webhtml{$cnt+1} != ' ') {
$webhtml = substr_replace($webhtml, ' ', $cnt + 1, 0);
}
}
}
return $webhtml;
}
}
?>
这是提取的关键字的示例:
testfalse, lang, {mw, loader, window, function, true, vector, user, gadget, mediawiki, legacy, options, usebetatoolbar, implementation, resourceloader, default
文章来源: http ://en.wikipedia.org/wiki/Searchengine
代码“Extkeys”,它是教程中代码的副本,适合我使其发挥作用。
我如何使代码可以提取网站的关键字,而不是 html?
此致!