php简单的抓取

php抓取当前页面中所有链接，再分析下载想要下载的链接，保存到数据库

<?PHP
    // GET all links from URL
    
    function remove_html_tags(&$item, $key)
    {
       $item=trim(strip_tags($item));
    }
    function get_path($url)
    {
        preg_match("/^(http:\/\/)?([^\/]+)/i", $url,$matches);
        return substr($url, strlen($matches[0]));
    }
    function get_host($url)
    {
        preg_match("/^(http:\/\/)?([^\/]+)/i", $url,$matches);
        return $matches[2];
    }
    function get_all_html($url)
    {
        $htmlString = '';
        $host = get_host($url);
        $path = get_path($url);
        $fp = fsockopen($host, 80, $errno, $errstr, 30);
        if (! $fp) 
        {
               echo "$errstr ($errno)<br />\n";
        } else 
        {
            $out = "GET $path HTTP/1.1\r\n";
            $out .= "Host:  $host \r\n";
            $out .= "Connection: Close\r\n\r\n";
            $myInt = fwrite($fp, $out);
            while (! feof($fp))
            {
                $htmlString = $htmlString.fgets($fp);
            }
            fclose($fp);
        }
        return $htmlString;
    }
    function get_links($url) 
    {
        $preg = 
        "/a[\s]+[^>]*?href[\s]?=[\s\"\']+(.*?)[\"\']+.*?>"
        ."([^<]+|.*?)?<\/a>/i";
          preg_match_all(trim($preg), 
                  get_all_html($url), $out, PREG_PATTERN_ORDER);
            $keys = $out[1];
            $values = $out[2];
            array_walk($values, 'remove_html_tags');
            return (array_combine($keys, $values));
    }
    //过滤关键字  不包含特定的字符串 得到想要下载的链接
    function filter_string($var)
    {   
        $pos = strpos($var, '中日研修');//只想要 含中日研修的链接
        if ($pos === false)
            return false;
        else
            return true;
    }
    //保存到数据库
    function save_html($title, $html)
    {
        $link = mysql_connect("localhost:3306","root","")OR die(mysql_error());
        $res = mysql_select_db("test", $link);
        $result = mysql_query("insert into save_info(title, content) values ('$title', '$html')",$link);
        return $result;
    }
    $url = "http://www.zggjlww.cn/share/?mods=news&action=list&id=15";
    $arr = get_links($url);
    $newMatches = array_filter($arr,"filter_string");
    
    //提取a 中的 href内容 合成完整的url, 连合标题保存到二维数组中
    //$strLinks = implode($newMatches,'<p></p>');

    //print_r($newMatches);
    //foreach所操作的是指定数组的一个拷贝，而不是该数组本身。 每次指向数组的第一位
       //foreach ($newMatches as $url => $site)
       //{
       //    echo "<br /> 址址: $site, url: $url";
       //}
       /*
        * reset($newMatches);
     * while (list($key, $val) = each($newMatches)) 
     * {
     *      echo "$key => $val\n";
     * }
        */
   
       reset($newMatches);
       $count = 1;
       while(list($key,$val) = each($newMatches))
       {
           $key = "http://" . get_host($url) . $key;
           $html = substr(htmlentities(get_all_html($key)), 2000, 10000);//我抓的页面太大了，截断了点了才能保存到mysql
           save_html($val,$html);
           $rest = count($newMatches) - $count;
           $count++ ;
           echo "$val = > $key <br />保存成功... 还有 $rest 张页面要处理...<p></p>";
       }
?> 

 mysql数据库创建脚本

create table save_info
(
    id int auto_increment not null,
    title text,
    content longtext,
    primary key(id)
);