PHP网络数据抓取方法

常见的抓取网络数据的一些方法。

1. 用 file_get_contents() 以 get 方式获取内容：

$url  = 'http://www.nowamagic.net/php/sock.php';
$html = file_get_contents($url);
echo $html;

 2. 用fopen()打开url，以get方式获取内容：

$url = 'http://www.nowamagic.net/php/sock.php';
$fp = fopen($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.nowamagic.net',
'name' => 'nowa magic'
);
$data = http_build_query($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.nowamagic.net/test2.php";
$context = stream_context_create($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

$url = 'http://www.nowamagic.net:80/php/sock.php?site=nowamagic.net';
function get_url($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);<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);"> </span>
5. 用fsockopen函数打开url，以POST方式获取完整的数据，包括header和body

$url = 'http://www.nowamagic.net:80/php/sock.php?site=nowamagic.net';
function HTTP_Post($URL,$data,$cookie, $referer="")
{
$URL_Info=parse_url($URL);
if($referer==""){//if not given use this script as referrer
$referer="www.nowamagic.net";
}
foreach($data as $key=>$value){
$values[] = "$key=".urlencode($value);
}
$data_string=implode("&",$values);
if(!isset($URL_Info["port"])){
$URL_Info["port"]=80;
}
$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.nowamagic.net',
'name' => 'nowa magic'
);
$cookie = '';
$referer = 'http://www.nowamagic.net/';
echo HTTP_Post($url, $data, $cookie, $referer);
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。

$url = 'http://www.nowamagic.net:80/php/sock.php?site=nowamagic.net';
$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;