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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 |
|---|---|
| 676 | /** |
| 677 | * Filters the languages available in the dropdown. |
| 678 | * |
| 679 | * @since MU (3.0.0) |
| 680 | * |
| 681 | * @param string[] $output Array of HTML output for the dropdown. |
| 682 | * @param string[] $lang_files Array of available language files. |
| 683 | * @param string $current The current language code. |
| 684 | */ |
| 685 | $output = apply_filters( 'mu_dropdown_languages', $output, $lang_files, $current ); |
| 686 | |
| 687 | echo implode( "\n\t", $output ); |
| 688 | } |
| 689 | |
| 690 | /** |
| 691 | * Displays an admin notice to upgrade all sites after a core upgrade. |
| 692 | * |
| 693 | * @since 3.0.0 |
| 694 | * |