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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 |
|---|---|
| 732 | /** |
| 733 | * Filter the languages available in the dropdown. |
| 734 | * |
| 735 | * @since MU |
| 736 | * |
| 737 | * @param array $output HTML output of the dropdown. |
| 738 | * @param array $lang_files Available language files. |
| 739 | * @param string $current The current language code. |
| 740 | */ |
| 741 | $output = apply_filters( 'mu_dropdown_languages', $output, $lang_files, $current ); |
| 742 | |
| 743 | echo implode( "\n\t", $output ); |
| 744 | } |
| 745 | |
| 746 | /** |
| 747 | * Displays an admin notice to upgrade all sites after a core upgrade. |
| 748 | * |
| 749 | * @since 3.0.0 |
| 750 | * |