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HomeBackend DevelopmentPHP Tutorialphp 调用远程url的六种方法小结_php技巧

示例代码1: 用file_get_contents 以get方式获取内容

复制代码 代码如下:

$url='http://www.baidu.com/';
$html=file_get_contents($url);
//print_r($http_response_header);
ec($html);
printhr();
printarr($http_response_header);
printhr();
?>


示例代码2: 用fopen打开url, 以get方式获取内容
复制代码 代码如下:


$fp=fopen($url,'r');
printarr(stream_get_meta_data($fp));
printhr();
while(!feof($fp)){
$result.=fgets($fp,1024);
}
echo"url body: $result";
printhr();
fclose($fp);
?>

示例代码3:用file_get_contents函数,以post方式获取url
复制代码 代码如下:

$data=array('foo'=>'bar');
$data=http_build_query($data);

$opts=array(
'http'=>array(
'method'=>'POST',
'header'=>"Content-type: application/x-www-form-urlencoded\r\n".
"Content-Length: ".strlen($data)."\r\n",
'content'=>$data
),
);
$context=stream_context_create($opts);
$html=file_get_contents('http://localhost/e/admin/test.html',false,$context);
echo$html;
?>

示例代码4:用fsockopen函数打开url,以get方式获取完整的数据,包括header和body
复制代码 代码如下:


functionget_url($url,$cookie=false){
$url=parse_url($url);
$query=$url[path]."?".$url[query];
ec("Query:".$query);
$fp=fsockopen($url[host],$url[port]?$url[port]:80,$errno,$errstr,30);
if(!$fp){
returnfalse;
}else{
$request="GET$queryHTTP/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,$request);
while(!@feof($fp)){
$result.=@fgets($fp,1024);
}
fclose($fp);
return$result;
}
}
//获取url的html部分,去掉header
functionGetUrlHTML($url,$cookie=false){
$rowdata=get_url($url,$cookie);
if($rowdata)
{
$body=stristr($rowdata,"\r\n\r\n");
$body=substr($body,4,strlen($body));
return$body;
}
returnfalse;
}
?>

示例代码5:用fsockopen函数打开url,以POST方式获取完整的数据,包括header和body
复制代码 代码如下:


functionHTTP_Post($URL,$data,$cookie,$referrer=""){
// parsing the given URL
$URL_Info=parse_url($URL);

// Building referrer
if($referrer=="")// if not given use this script. as referrer
$referrer="111";

// making string from $data
foreach($dataas$key=>$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;

// 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,$request);
while(!feof($fp)){
$result.=fgets($fp,1024);
}
fclose($fp);
return$result;
}
printhr();
?>

示例代码6:使用curl库,使用curl库之前,你可能需要查看一下php.ini,查看是否已经打开了curl扩展
复制代码 代码如下:


$ch = curl_init();
$timeout = 5;
curl_setopt ($ch, CURLOPT_URL, 'http://www.baidu.com/');
curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
$file_contents = curl_exec($ch);
curl_close($ch);
echo $file_contents;
?>

关于curl库:
curl官方网站http://curl.haxx.se/
curl 是使用URL语法的传送文件工具,支持FTP、FTPS、HTTP HTPPS SCP SFTP TFTP TELNET DICT FILE和LDAP。curl 支持SSL证书、HTTP POST、HTTP PUT 、FTP 上传,kerberos、基于HTT格式的上传、代理、cookie、用户+口令证明、文件传送恢复、http代理通道和大量其他有用的技巧
复制代码 代码如下:


functionprintarr(array$arr)
{
echo"
Row field count: ".count($arr)."
";
foreach($arras$key=>$value)
{
echo"$key=$value
";
}
}
?>

======================================================
PHP抓取远程网站数据的代码
现在可能还有很多程序爱好者都会遇到同样的疑问,就是要如何像搜索引擎那样去抓取别人网站的HTML代码,然后把代码收集整理成为自己有用的数据!今天就等我介绍一些简单例子吧.

Ⅰ.抓取远程网页标题的例子:
以下是代码片段:
复制代码 代码如下:

/*
+-------------------------------------------------------------
+抓取网页标题的代码,直接拷贝本代码片段,另存为.php文件执行即可.
+-------------------------------------------------------------
*/

error_reporting(7);
$file = fopen ("http://www.jb51.net/", "r");
if (!$file) {
echo "Unable to open remote file.\n";
exit;
}
while (!feof ($file)) {
$line = fgets ($file, 1024);
if (eregi ("(.*)", $line, $out)) {
$title = $out[1];
echo "".$title."";
break;
}
}
fclose($file);

//End
?>

Ⅱ.抓取远程网页HTML代码的例子:

以下是代码片段:
复制代码 代码如下:

php
/*
+----------------
+DNSing Sprider
+----------------
*/

$fp = fsockopen("www.dnsing.com", 80, $errno, $errstr, 30);
if (!$fp) {
echo "$errstr ($errno)
\n";
} else {
$out = "GET / HTTP/1.1\r\n";
$out .= "Host:www.dnsing.com\r\n";
$out .= "Connection: Close \r\n\r\n";
fputs($fp, $out);
while (!feof($fp)) {
echo fgets($fp, 128);
}
fclose($fp);
}
//End
?>
以上两个代码片段都直接Copy回去运行就知道效果了,上面的例子只是抓取网页数据的雏形,要使其更适合自己的使用,情况有各异.所以,在此各位程序爱好者自己好好研究一下吧.

===============================

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。

//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$url = $prefix . $i .".htm";
echo "Get ". $url ."...";
$url_str = get_content_url(get_url($url));
echo " OK\n";
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 " OK\n";
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 " OK\n";
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/1.1\r\n";
$header .= "Accept: */*\r\n";
$header .= "Accept-Language: zh-cn\r\n";
$header .= "Accept-Encoding: gzip, deflate\r\n";
$header .= "User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; Maxthon; InfoPath.1; .NET CLR 2.0.50727)\r\n";
$header .= "Host: ". $host ."\r\n";
$header .= "Connection: Keep-Alive\r\n";
//$header .= "Cookie: cnzz02=2; rtime=1; ltime=1148456424859; cnzz_eid=56601755-\r\n\r\n";
$header .= "Connection: Close\r\n\r\n";

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="|--:**:--|"){
$regx = "/href\s*=\s*['\"]*([^>'\"\s]+)[\"'>]*\s*(.*?)/i";
preg_match_all($regx, $str, $result);

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

?>

======================================================

同一域名对应多个IP时,PHP获取远程网页内容的函数

fgc就是简单的读取过来,把一切操作封装了
fopen也进行了一些封装,但是需要你循环读取得到所有数据。
fsockopen这是直板板的socket操作。
如果仅仅是读取一个html页面,fgc更好。
如果公司是通过防火墙上网,一 般的file_get_content函数就不行了。当然,通过一些socket操作,直接向proxy写http请求也是可以的,但是比较麻烦。
如果你能确认文件很小,可以任选以上两种方式fopen ,join('',file($file));。比如,你只操作小于1k的文件,那最好还是用file_get_contents吧。

如果确定文件很大,或者不能确定文件的大小,那就最好使用文件流了。fopen一个1K的文件和fopen一个1G的文件没什么明显的区别。内容长,就可以花更长的时间去读,而不是让脚本死掉。

----------------------------------------------------
http://www.phpcake.cn/archives/tag/fsockopen
PHP获取远程网页内容有多种方式,例如用自带的file_get_contents、fopen等函数。


echo file_get_contents("http://img.jb51.net/abc.php");
?>
 但是,在DNS轮询等负载均衡中,同一域名,可能对应多台服务器,多个IP。假设img.jb51.net被DNS解析到 72.249.146.213、72.249.146.214、72.249.146.215三个IP,用户每次访问img.jb51.net,系统会根据负载均衡的相应算法访问其中的一台服务器。
  上周做一个视频项目时,就碰到这样一类需求:需要依次访问每台服务器上的一个PHP接口程序(假设为abc.php),查询这台服务器的传输状态。

  这时就不能直接用file_get_contents访问http://img.jb51.net/abc.php了,因为它可能一直重复访问某一台服务器。

  而采用依次访问http://72.249.146.213/abc.php、http://72.249.146.214/abc.php、http://72.249.146.215/abc.php的方法,在这三台服务器上的Web Server配有多个虚拟主机时,也是不行的。

  通过设置本地hosts也不行,因为hosts不能设置多个IP对应同一个域名。

  那就只有通过PHP和HTTP协议来实现:访问abc.php时,在header头中加上img.jb51.net域名。于是,我写了下面这个PHP函数:
复制代码 代码如下:


/************************
* 函数用途:同一域名对应多个IP时,获取指定服务器的远程网页内容
* 创建时间:2008-12-09
* 创建人:张宴(img.jb51.net)
* 参数说明:
* $ip 服务器的IP地址
* $host 服务器的host名称
* $url 服务器的URL地址(不含域名)
* 返回值:
* 获取到的远程网页内容
* false 访问远程网页失败
************************/
function HttpVisit($ip, $host, $url)
{
$errstr = '';
$errno = '';
$fp = fsockopen ($ip, 80, $errno, $errstr, 90);
if (!$fp)
{
return false;
}
else
{
$out = "GET {$url} HTTP/1.1\r\n";
$out .= "Host:{$host}\r\n";
$out .= "Connection: close\r\n\r\n";
fputs ($fp, $out);

while($line = fread($fp, 4096)){
$response .= $line;
}
fclose( $fp );

//去掉Header头信息
$pos = strpos($response, "\r\n\r\n");
$response = substr($response, $pos + 4);

return $response;
}
}

//调用方法:
$server_info1 = HttpVisit("72.249.146.213", "img.jb51.net", "/abc.php");
$server_info2 = HttpVisit("72.249.146.214", "img.jb51.net", "/abc.php");
$server_info3 = HttpVisit("72.249.146.215", "img.jb51.net", "/abc.php");
?>
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