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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 |
|---|---|
| 749 | /** |
| 750 | * Filters the languages available in the dropdown. |
| 751 | * |
| 752 | * @since MU |
| 753 | * |
| 754 | * @param array $output HTML output of the dropdown. |
| 755 | * @param array $lang_files Available language files. |
| 756 | * @param string $current The current language code. |
| 757 | */ |
| 758 | $output = apply_filters( 'mu_dropdown_languages', $output, $lang_files, $current ); |
| 759 | |
| 760 | echo implode( "\n\t", $output ); |
| 761 | } |
| 762 | |
| 763 | /** |
| 764 | * Displays an admin notice to upgrade all sites after a core upgrade. |
| 765 | * |
| 766 | * @since 3.0.0 |
| 767 | * |