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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 |
|---|---|
| 711 | /** |
| 712 | * Filter the languages available in the dropdown. |
| 713 | * |
| 714 | * @since MU |
| 715 | * |
| 716 | * @param array $output HTML output of the dropdown. |
| 717 | * @param array $lang_files Available language files. |
| 718 | * @param string $current The current language code. |
| 719 | */ |
| 720 | $output = apply_filters( 'mu_dropdown_languages', $output, $lang_files, $current ); |
| 721 | |
| 722 | echo implode( "\n\t", $output ); |
| 723 | } |
| 724 | |
| 725 | /** |
| 726 | * Displays an admin notice to upgrade all sites after a core upgrade. |
| 727 | * |
| 728 | * @since 3.0.0 |
| 729 | * |