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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 |
|---|---|
| 2551 | * Filters the result when generating a unique file name. |
| 2552 | * |
| 2553 | * @since 4.5.0 |
| 2554 | * |
| 2555 | * @param string $filename Unique file name. |
| 2556 | * @param string $ext File extension, eg. ".png". |
| 2557 | * @param string $dir Directory path. |
| 2558 | * @param callable|null $unique_filename_callback Callback function that generates the unique file name. |
| 2559 | */ |
| 2560 | return apply_filters( 'wp_unique_filename', $filename, $ext, $dir, $unique_filename_callback ); |
| 2561 | } |
| 2562 | |
| 2563 | /** |
| 2564 | * Helper function to check if a file name could match an existing image sub-size file name. |
| 2565 | * |
| 2566 | * @since 5.3.1 |
| 2567 | * @access private |
| 2568 | * |
| 2569 | * @param string $filename The file name to check. |