filename. Similar to the Unix C
unlink() function. Returns TRUE on success or FALSE on failure.
Note: As of PHP 5.0.0 unlink() can also be used with some URL wrappers. Refer to Appendix N for a listing of which wrappers support unlink().
Note: Context support was added with PHP 5.0.0. For a description of contexts, refer to Reference CLX, Stream Functions.
See also rmdir() for removing directories.