Unique and temporary file names in PHP?

In PHP, you can use the tempnam() function to generate a unique and temporary file name. The function takes two parameters: the directory where the file should be created, and a prefix for the file name. For example:

<?php

$temp_file_name = tempnam("/tmp", "temp");

echo $temp_file_name;

This will create a file in the "/tmp" directory with a name that starts with "temp" and ends with a unique string of characters.

Alternatively, you can use uniqid() function to generate unique ids, you can use it as filename.

<?php

$temp_file_name = uniqid();

echo $temp_file_name ;

You should also take care of cleaning up the temporary files after you are done with them, using unlink() function.