The following is a list of the various URL style
protocols that PHP has built-in for use with the filesystem
functions such as fopen() and
copy(). In addition to these
wrappers, as of PHP 4.3, you can write your own wrappers
using PHP script and
stream_register_wrapper().
PHP 3, PHP 4. https:// since
PHP 4.3
http://example.com
http://user:password@example.com
https://example.com
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.
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.
The stream allows access to the body of the
resource; the headers are stored in the $http_response_header variable. Since PHP
4.3, 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.
注: HTTPS is supported starting from PHP 4.3, if you have compiled in support for OpenSSL.