Deletes filename. Similar to the Unix C unlink() function. An E_WARNING level error will be generated on failure.
Path to the file.
Note: Context support was added with PHP 5.0.0. For a description of contexts, refer to Streams.
Returns true on success or false on failure.
On Windows, it is now possible to unlink() files with handles in use, while formerly that would fail. However, it is still not possible to re-create the unlinked file, until all handles to it have been closed.