A PHP file that should be run once and automatically delete itself. Is this possible?

Yes, it can be done using the unlink function. As shown below -

<?php unlink(__FILE__); ?>

Another alternative way to delete the script, whether or not the exit function is called, as shown below ^minus;

class DeleteOnExit {
   function __destruct() {
      unlink(__FILE__);
   }
}
$delete_on_exit = new DeleteOnExit();

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