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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. |