file://

The file:// wrapper is a native PHP wrapper, to access files on a local files, on the host system.

It may also be omitted, as the default behavior is to read files on the local system.

<?php

// display the content of a file
print_r(file_get_content('file:///tmp/file.txt);

// also possible
print_r(file_get_content('/tmp/file.txt);

?>

Documentation

Related : Wrapper, PHP Wrappers