php 文章采集正则代码

//采集html
function getwebcontent($url){
$ch = curl_init();
$timeout = 10;
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
curl_setopt ($ch, CURLOPT_FOLLOWLOCATION, 1);
$contents = trim(curl_exec($ch));
curl_close($ch);
return $contents;
}


//获得标题和url
$string =
getwebcontent('http://www.***.com/learn/zhunbeihuaiyun/jijibeiyun/2');
//正则匹配<li>获取标题和地址
preg_match_all ("/<li><a href=https://www.jb51.net/article/\"\/learn\/article\/(.*)\">(.*)<\/a>/",$string, $out, PREG_SET_ORDER);
foreach($out as $key => $value){
$article['title'][] = $out[$key][2];
$article['link'][] = "http://www.***.com/learn/article/".$out[$key][1];
}
//根据url获取文章内容
foreach($article['link'] as $key=>$value){
$content_html = getwebcontent($article['link'][$key]);
preg_match("/<div id=pagenum_0(.*)>[\s|\S]*?<\/div>/",$content_html,$matches);
$article[content][$key] = $matches[0];

}
//不转码还真不能保存成文件
foreach($article[title] as $key=>$value){
$article[title][$key] = iconv('utf-8', 'gbk', $value);//转码
}
//存入文件
$num = count($article['title']);
for($i=0; $i<$num; $i++){
file_put_contents("{$article[title][$i]}.txt", $article['content'][$i]);
}
?>