Protocol¶
A protocol is a scheme part of a URL, with an associated wrapper.
In a URL like ftp://www.site.com/file.txt, the protocol is ftp, and relates to the FTP protocol. It is also a predefined PHP wrapper.
<?php
$html = file_get_content('http://www.php.net/');
?>
See also Protocols and Wrapper in PHP
Related : Wrapper