You can schedule a task. On linux/unix, this generally involves using "cron". On windows, you'll use "Scheduled Tasks".
The PHP script will send the file to your email address.
The task scheduler will run your PHP script once a day at 4:15pm.
You should have PHP installed as a command-line interpreter for this to work. On windows, php.exe comes with the standard .zip download of PHP. On linux, the php executable interpreter is compiled whenever you compile PHP.
You can either put this executable in your system path, or just explicitly call it out.
For example, on my Windows machine, I'd create a scheduled task to run:
C:\php\cli\php.exe -q p:\path\to\my\phpfile.php