PHP 获取网页内容的几个函数

稍微有点意义的函数是：get_content_by_socket(),get_url(),get_content_url(),get_content_object 几个函数，也许能够给你点什么想法。
经测试代码如下：

<?PHP

//获取所有内容url保存到文件
function get_index($save_file,$prefix=index_){
    $count = 68;
    $i = 1;
    if (file_exists($save_file)) @unlink($save_file);
    $fp = fopen($save_file,a+) or die(Open . $save_file . Failed);
    while($i<$count){
        $url = $prefix . $i ..htm;
        echo Get . $url ....;
        $url_str = get_content_url(get_url($url));
        echo  OKn;
        fwrite($fp,$url_str);
        ++$i;
    }
    fclose($fp);
}

//获取目标多媒体对象
function get_object($url_file,$save_file,$split=|--:**:--|){
    if (!file_exists($url_file)) die($url_file . not exist);
    $file_arr = file($url_file);
    if (!is_array($file_arr) || empty($file_arr)) die($url_file . not content);
    $url_arr = array_unique($file_arr);
    if (file_exists($save_file)) @unlink($save_file);
    $fp = fopen($save_file,a+) or die(Open save file . $save_file . Failed);
    foreach($url_arr as $url){
        if (empty($url)) continue;
        echo Get . $url ....;
        $html_str = get_url($url);
        echo $html_str;
        echo $url;
        exit;
        $obj_str = get_content_object($html_str);
        echo  OKn;
        fwrite($fp,$obj_str);
    }
    fclose($fp);
}

//遍历目录获取文件内容
function get_dir($save_file,$dir){
    $dp = opendir($dir);
    if (file_exists($save_file)) @unlink($save_file);
    $fp = fopen($save_file,a+) or die(Open save file . $save_file . Failed);
    while(($file = readdir($dp)) != false){
        if ($file!=. && $file!=..){
            echo Read file . $file ....;
            $file_content = file_get_contents($dir . $file);
            $obj_str = get_content_object($file_content);
            echo  OKn;
            fwrite($fp,$obj_str);
        }
    }
    fclose($fp);
}

//获取指定url内容
function get_url($url){
    $reg = '/^http:\/\/[^\/].+$/';
    if (!preg_match($reg,$url)) die($url . invalid);
    $fp = fopen($url,r) or die(Open url: . $url . Failed.);
    while($fc = fread($fp,8192)){
        $content .= $fc;
    }
    fclose($fp);
    if (empty($content)){
        die(Get url: . $url . content Failed.);
    }
    return $content;
}

//使用socket获取指定网页
function get_content_by_socket($url,$host){
    $fp = fsockopen($host,80) or die(Open . $url . Failed);
    $header = GET /.$url . HTTP/1.1rn;
    $header .= Accept: */*rn;
    $header .= Accept-Language: zh-cnrn;
    $header .= Accept-Encoding: gzip,deflatern;
    $header .= User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; InfoPath.1; .NET CLR 2.0.50727)rn;
    $header .= Host: . $host .rn;
    $header .= Connection: Keep-Alivern;
    //$header .= Cookie: cnzz02=2; rtime=1; ltime=1148456424859; cnzz_eid=56601755-rnrn;
    $header .= Connection: Closernrn;

    fwrite($fp,$header);
    while (!feof($fp)) {
        $contents .= fgets($fp,8192);
    }
    fclose($fp);
    return $contents;
}

//获取指定内容里的url
function get_content_url($host_url,$file_contents){

    //$reg = '/^(#|javascript.*?|ftp://.+|http://.+|.*?href.*?|play.*?|index.*?|.*?asp)+$/i';
    //$reg = '/^(down.*?.html|d+_d+.htm.*?)$/i';
    $rex = /([hH][rR][eE][Ff])s*=s*[']*([^>'s]+)['>]*s*/i;
    $reg = '/^(down.*?.html)$/i';
    preg_match_all ($rex,$file_contents,$r);
    $result = ; //array();
    foreach($r as $c){
        if (is_array($c)){
            foreach($c as $d){
                if (preg_match($reg,$d)){ $result .= $host_url . $d.n; }
            }
        }
    }
    return $result;
}

//获取指定内容中的多媒体文件
function get_content_object($str,$split=|--:**:--|){
    $regx = /hrefs*=s*[']*([^>'s]+)['>]*s*(<b>.*?</b>)/i;
    preg_match_all($regx,$str,$result);

    if (count($result) == 3){
        $result[2] = str_replace(<b>多媒体： ,,$result[2]);
        $result[2] = str_replace(</b>,$result[2]);
        $result = $result[1][0] . $split .$result[2][0] . n;
    }
    return $result;
}

?>


/***   代码来自编程之家 jb51.cc（jb51.cc）   ***/