Re: [FAQ] How do I retrieve a page from a web site? (Was: PHP behaving like a user using a browser)
- From: "R. Rajesh Jeba Anbiah" <ng4rrjanbiah@xxxxxxxxxxxxxx>
- Date: 26 Apr 2005 10:31:24 -0700
Q: How do I retrieve a page from a web site?
A: Pass a URL to file() or file_get_contents(). The former returns the
contents as an array of lines. The latter returns the same as string.
Example:
$html = file_get_contents('http://www.example.com/');
Q: How do I retrieve a page from a web site that does browser
detection?
A: Use ini_set() to change the configuration option "user_agent." This
sets the User-Agent header sent by PHP.
Example:
ini_set('user_agent', 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT
5.1)');
$html = file_get_contents('http://www.example.com/');
Q: How do I retrieve a page from a web site that requires a cookie?
A: Use stream_context_create() to create a HTTP context with Cookie as
one of the headers. Then, if you are coding in PHP 5, pass the context
to file() or file_get_contents() as the third parameter. In PHP 4
either function accepts a context, so you need to open the URL with
fopen() and retrieve the data a chunk at a time with fread().
Example:
$opts = array(
'http'=>array(
'method'=> 'GET',
'header'=>
"Accept-language: en\r\n" .
"Cookie: foo=bar\r\n"
)
);
$context = stream_context_create($opts);
$f = fopen($url, "rb", false, $context);
while($data = fread($f, 1024)) {
echo $data;
}
stream_context_create() is available in PHP 4.3.0 and above. If you are
using an older version, you would need the cURL functions or use
fsockopen() to open the connection and send the cookie header with
fputs().
Example 1:
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HTTPHEADER,
array('Cookie: foo=bar'));
curl_exec($ch);
curl_close($ch);
Example 2:
$fp = fsockopen($host, $port);
fputs($fp, "GET / HTTP/1.0\r\n");
fputs($fp, "Host: $host\r\n");
fputs($fp, "Cookie: foo=bar\r\n\r\n");
while ($data = fgets($fp, 1024)) {
echo $data;
}
Refer:
http://www.php.net/curl
http://curl.haxx.se/libcurl/php/examples/?ex=cookiejar.php
Q. My PHP application retrieves a page from a web site that uses
cookies. How do I get the cookie?
A. Use fopen() to open a connection to the server, then call
stream_get_meta_data() to obtain information about the connection. The
function returns an associative array. The 'wrapper_data' element holds
an array containing the HTTP response headers. Loop through it and
parse the string that begins with "Set-Cookie."
Refer:
http://www.phpclasses.org/httpclient
http://pear.php.net/package/HTTP_Client
++++++
@revision 2 Janwillem Borleffs added other examples
@revision 3 URLs changed to www.example.com. Added reference links. Few
double quotes quickly converted to single quotes
@todo Cleanup. Trim
.
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