PHP写采集心得
在论坛好久了没有怎么正式的发表过东西,今天给大家共享一下我的采集代码!
思路:
采集程序的思路很简单大体可以分为以下几个步骤:
1.获取远程文件源代码(file_get_contents或用fopen).
2.分析代码得到自己想要的内容(这里用正规匹配,一般是得到分页)。
3.跟根得到的内容进行下载入库等操作。
在这里第二步有可能要重复的操作好几次,比如说要先分析一下分页地址,在分析一下内页的内容才能取得我们想要的东西。
代码:
记的以前发部过部分的代码今天我在这里在简单的发部一下
复制PHP内容到剪贴板
PHP代码:
@$nl=file_get_contents($rs[url]);//抓取远程内容
preg_match_all("/var url = "gameswf/(.*?).swf";/is",$nl,$connect);//进行正规匹配取得自己要的内容
mysql_query("insert ......插入数据库部分");
上面的代码就是所有采集要用到的代码了,当然大家也可以用fope来作,我个人喜欢用file_get_contents。
下面在共享一下我的下载图片flash到本地的办法,太简单了两行代码
复制PHP内容到剪贴板
PHP代码:
if(@copy($url,$newurl)){
echo ok;
}
在论坛上以前还发过一个图片下载函数这会也放上来给大家
复制PHP内容到剪贴板
PHP代码:
/*本存图片函数*/
function getimg($url,$filename){
/*判断图片的url是否为空,如果为空停止函数*/
if($url==""){
return false;
}
/*取得图片的扩展名,存入变量$ext中*/
$ext=strrchr($url,".");
/*判断是否是合法的图片文件*/
if($ext!=".gif" && $ext!=".jpg"){
return false;
}
/*读取图片*/
$img=file_get_contents($url);
/*打开指定的文件*/
$fp=@fopen($filename.$ext,"a");
/*写入图片到指点的文件*/
fwrite($fp,$img);
/*关闭文件*/
fclose($fp);
/*返回图片的新文件名*/
return $filename.$ext;
}
共享一下个人的采集心德:
1.不采那些作防盗链了的站,其实可以作假来路但是这样的站采集成本太高
2.采集尽量快的站,最好在本地进行采集
3.采集时有很多时候可以先把一部分数据存入数据库,等以后进行下一步的处理。
4.采集的时候一定要作好出错处理,我一般都是如果采集三次没有成功就跳过。以前经常就因为一条内容不能采就卡在那里一直的采。
5.入库前一定要作好判断,检查内容的合法,过滤不必要的字符串。

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