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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 2738 | * |
| 2739 | * @param string $filename Unique file name. |
| 2740 | * @param string $ext File extension. Example: ".png". |
| 2741 | * @param string $dir Directory path. |
| 2742 | * @param callable|null $unique_filename_callback Callback function that generates the unique file name. |
| 2743 | * @param string[] $alt_filenames Array of alternate file names that were checked for collisions. |
| 2744 | * @param int|string $number The highest number that was used to make the file name unique |
| 2745 | * or an empty string if unused. |
| 2746 | */ |
| 2747 | return apply_filters( 'wp_unique_filename', $filename, $ext, $dir, $unique_filename_callback, $alt_filenames, $number ); |
| 2748 | } |
| 2749 | |
| 2750 | /** |
| 2751 | * Helper function to test if each of an array of file names could conflict with existing files. |
| 2752 | * |
| 2753 | * @since 5.8.1 |
| 2754 | * @access private |
| 2755 | * |
| 2756 | * @param string[] $filenames Array of file names to check. |