Well, let's look and find out:
[man]readfile[/man]
PHP Manual wrote: Reads a file and writes it to the output buffer.
Returns the number of bytes read from the file. If an error occurs, FALSE is returned and unless the function was called as @readfile(), an error message is printed.
Tip:You can use a URL as a filename with this function if the fopen wrappers have been enabled. See fopen() for more details on how to specify the filename and Appendix M for a list of supported URL protocols.
You can use the optional second parameter and set it to TRUE, if you want to search for the file in the include_path, too.
[man]include[/man] & [man]require[/man]
PHP Manual wrote:If "URL fopen wrappers" are enabled in PHP (which they are in the default configuration), you can specify the file to be included using a URL (via HTTP or other supported wrapper - see Appendix M for a list of protocols) instead of a local pathname. If the target server interprets the target file as PHP code, variables may be passed to the included file using a URL request string as used with HTTP GET. This is not strictly speaking the same thing as including the file and having it inherit the parent file's variable scope; the script is actually being run on the remote server and the result is then being included into the local script.
So let's recap:
readfile: YES
include: YES
require: YES
Does that answer your question?
