Description

The tempnam() interface is:

tempnam($dir, $prefix)

I suggest adding a third argument, $suffix, that is added to the filename after the random component. This can default to '' or null for backwards compatibility. This is quite useful when the temporary file is consumed for a specific purpose that expects a suffix.

Example

$filesystem->tempnam('/tmp', 'prefix_', '.png');

Would create a file like: /tmp/prefix_abcd1234.png.