PHP抓取网络数据的6种常见方法

   |    2016年5月14日  |   PHP, 编程语言  |    0 条评论  |    1742

2.pic

本节简单罗列一下一些常见的抓取网络数据的方法。

1. 用 file_get_contents 以 get 方式获取内容:

$url = 'http://www.94joy.com';
$html = file_get_contents($url);
echo $html;

2. 用fopen打开url,以get方式获取内容

$url = 'http://www.94joy.com';
$fp = fopen($url, 'r');
stream_get_meta_data($fp);
$result = '';
while(!feof($fp))
{
    $result .= fgets($fp, 1024);
}
echo "url body: $result";
fclose($fp);

3. 用file_get_contents函数,以post方式获取url

$data = array(
	'foo'=>'bar', 
	'baz'=>'boom', 
	'site'=>'www.94joy.com', 
	'name'=>'hello joy'); 
	
$data = http_build_query($data); 

//$postdata = http_build_query($data);
$options = array(
	'http' => array(
		'method' => 'POST',
		'header' => 'Content-type:application/x-www-form-urlencoded',
		'content' => $data
		//'timeout' => 60 * 60 // 超时时间(单位:s)
	)
);

$url = "http://www.94joy.com";
$context = stream_context_create($options);
$result = file_get_contents($url, false, $context);

echo $result;

4. 用 fsockopen 函数打开url,以get方式获取完整的数据,包括header和body

$url = 'http://www.94joy.com/php/sock.php?site=94joy.com';
function get_url($url,$cookie=false)
{
    $url = parse_url($url);
    $query = $url['path']."?".$url['query'];
    echo "Query:".$query;
    $fp = fsockopen( $url['host'], $url['port']?$url['port']:80 , $errno, $errstr, 30);
    if (!$fp)
    {
        return false;
    }
    else {
        $request = "GET $query HTTP/1.1\r\n";
        $request .= "Host: $url[host]\r\n";
        $request .= "Connection: Close\r\n";
        if($cookie) $request.="Cookie:   $cookie\n";
        $request.="\r\n";
        fwrite($fp,$request);
		$result = '';
        while(!feof($fp))
        {
            $result .= @fgets($fp, 1024);
        }
        fclose($fp);
        return $result;
    }
}
//获取url的html部分,去掉header
function GetUrlHTML($url,$cookie=false)
{
    $rowdata = get_url($url,$cookie);
    if($rowdata)
    {
        $body= stristr($rowdata,"\r\n\r\n");
        $body=substr($body,4,strlen($body));
        return $body;
    }

    return false;
}

echo get_url($url);

echo GetUrlHTML($url);

程序输出:

Query:/php/sock.php?site=94joy.com HTTP/1.1 200 OK
Date: Wed, 19 Feb 2014 06:06:25 GMT
Server: Apache/2.2.3 (CentOS)
X-Powered-By: PHP/5.3.3
Vary: Accept-Encoding
Content-Length: 21
Connection: close
Content-Type: text/html; charset=UTF-8

Welcome to 94joy 

Query:/php/sock.php?site=94joy.com Welcome to 94joy

5. 用fsockopen函数打开url,以POST方式获取完整的数据,包括header和body

$url = 'http://www.94joy.com/php/sock.php?site=94joy.com';
function HTTP_Post($URL,$data,$cookie, $referer="")
{
    // parsing the given URL
    $URL_Info=parse_url($URL);

    // Building referrer
    if($referer=="") // if not given use this script as referrer
        $referer="www.94joy.com";

    // making string from $data
    foreach($data as $key=> $value)
    $values[]="$key=".urlencode($value);
    $data_string=implode("&",$values);

    // Find out which port is needed - if not given use standard (=80)
    if(!isset($URL_Info["port"]))
        $URL_Info["port"]=80;
	
    $request = '';
    // building POST-request:
    $request.="POST ".$URL_Info["path"]." HTTP/1.1\n";
    $request.="Host: ".$URL_Info["host"]."\n";
    $request.="Referer: $referer\n";
    $request.="Content-type: application/x-www-form-urlencoded\n";
    $request.="Content-length: ".strlen($data_string)."\n";
    $request.="Connection: close\n";

    $request.="Cookie:   $cookie\n";

    $request.="\n";
    $request.=$data_string."\n";

    $fp = fsockopen($URL_Info["host"],$URL_Info["port"]);
    fputs($fp, $request);
	$result = '';
    while(!feof($fp))
    {
        $result .= fgets($fp, 1024);
    }
    fclose($fp);

    return $result;
}

$data = array(
	'foo'=>'bar', 
	'baz'=>'boom', 
	'site'=>'www.94joy.com', 
	'name'=>'hello joy'); 
	
$cookie = '';
$referer = 'http://www.94joy.com/';
	
echo HTTP_Post($url, $data, $cookie, $referer);

程序输出:

HTTP/1.1 200 OK
Date: Wed, 19 Jul 2016 06:15:38 GMT
Server: Apache/2.2.3 (CentOS)
X-Powered-By: PHP/5.6.3
Vary: Accept-Encoding
Content-Length: 21
Connection: close
Content-Type: text/html; charset=UTF-8

Welcome to 94joy 

6. 使用curl库,使用curl库之前,可能需要查看一下php.ini是否已经打开了curl扩展。

使用 curl 代码比较简洁,代码也比较规范,容易理解:

$url = 'http://www.94joy.com/php/sock.php?site=94joy.com';
$ch = curl_init();
$timeout = 5;
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$file_contents = curl_exec($ch);
curl_close($ch);
 
echo $file_contents;

这里就大概列举这么 6 种抓取网络数据的方式,也是比较常见的,让大家先有个总体的理解,还有各方法的比较。

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