Manuale PHP
Indietro	Appendice L. List of Supported Protocols/Wrappers	Avanti

HTTP and HTTPS

PHP 3, PHP 4, PHP 5. https:// since PHP 4.3.0

http://example.com
http://example.com/file.php?var1=val1&var2=val2
http://user:password@example.com
https://example.com
https://example.com/file.php?var1=val1&var2=val2
https://user:password@example.com

Allows read-only access to files/resources via HTTP 1.0, using the HTTP GET method. A Host: header is sent with the request to handle name-based virtual hosts. If you have configured a user_agent string using your ini file or the stream context, it will also be included in the request.

Avvertimento

When using SSL, Microsoft IIS will violate the protocol by closing the connection without sending a close_notify indicator. PHP will report this as "SSL: Fatal Protocol Error" when you reach the end of the data. To workaround this, you should lower your error_reporting level not to include warnings. PHP 4.3.7 and higher can detect buggy IIS server software when you open the stream using the https:// wrapper and will suppress the warning for you. If you are using fsockopen() to create an ssl:// socket, you are responsible for detecting and suppressing the warning yourself.

Redirects have been supported since PHP 4.0.5; if you are using an earlier version you will need to include trailing slashes in your URLs. If it's important to know the URL of the resource where your document came from (after all redirects have been processed), you'll need to process the series of response headers returned by the stream.


<?php
$url = 'http://www.example.com/redirecting_page.php';

$fp = fopen($url, 'r');

/* Prior to PHP 4.3.0 use $http_response_header 
   instead of stream_get_meta_data() */
$meta_data = stream_get_meta_data($fp);
foreach($meta_data['wrapper_data'] as $response) {

  /* Were we redirected? */
  if (substr(strtolower($response), 0, 10) == 'location: ') {
    /* update $url with where we were redirected to */
    $url = substr($response, 10);
  }

}

?>

The stream allows access to the body of the resource; the headers are stored in the $http_response_header variable. Since PHP 4.3.0, the headers are available using stream_get_meta_data().

HTTP connections are read-only; you cannot write data or copy files to an HTTP resource.

Nota: HTTPS is supported starting from PHP 4.3.0, if you have compiled in support for OpenSSL.

Tabella L-2. Wrapper Summary

Attribute	Supported
Restricted by allow_url_fopen.	Yes
Allows Reading	Yes
Allows Writing	No
Allows Appending	No
Allows Simultaneous Reading and Writing	N/A
Supports stat()	No
Supports unlink()	No
Supports rename()	No
Supports mkdir()	No
Supports rmdir()	No

Tabella L-3. Context options (as of PHP 5.0.0)

Name	Usage	Default
`method`	`GET`, `POST`, or any other HTTP method supported by the remote server.	`GET`
`header`	Additional headers to be sent during request. Values in this option will override other values (such as `User-agent:`, `Host:`, and `Authentication:`).
`user_agent`	Value to send with User-Agent: header. This value will only be used if user-agent is not specified in the `header` context option above.	`php.ini` setting: `user_agent`
`content`	Additional data to be sent after the headers. Typically used with POST or PUT requests.
`proxy`	URI specifying address of proxy server. (e.g. `tcp://proxy.example.com:5100` ).
`request_fulluri`	When set to `TRUE`, the entire URI will be used when constructing the request. (i.e. `GET http://www.example.com/path/to/file.html HTTP/1.0`). While this is a non-standard request format, some proxy servers require it.	`FALSE`

Underlying socket stream context options: Additional context options may be supported by the underlying transport For http:// streams, refer to context options for the tcp:// transport. For https:// streams, refer to context options for the ssl:// transport.

Indietro	Partenza	Avanti
List of Supported Protocols/Wrappers	Risali	FTP and FTPS