Filters the result when generating a unique file name.

Parameters

$filenamestring

Unique file name.

$extstring

File extension. Example: ".png".

$dirstring

Directory path.

$unique_filename_callbackcallable|null

Callback function that generates the unique file name.

$alt_filenamesstring[]

Array of alternate file names that were checked for collisions.

$numberint|string

The highest number that was used to make the file name unique or an empty string if unused.

Source

return apply_filters( 'wp_unique_filename', $filename, $ext, $dir, $unique_filename_callback, $alt_filenames, $number );

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