|filename||The filename being read.|
|use_include_path||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.|
|context||A context stream resource.|
Most filenames passed to functions in this topic are:
SplFileInfo, which is the value in the iteration of
scheme://to specify the protocol wrapper to manage with. For example,
file_get_contents("http://example.com")retrieves content from http://example.com.
DIRECTORY_SEPARATORon Windows is a backslash, and the system returns backslashes for paths by default, the developer can still use
/as the directory separator. Therefore, for compatibility, developers can use
/as directory separators on all systems, but be aware that the values returned by the functions (e.g.
realpath) may contain backslashes.