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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 |
|---|---|
| 668 | /** |
| 669 | * Filters the languages available in the dropdown. |
| 670 | * |
| 671 | * @since MU (3.0.0) |
| 672 | * |
| 673 | * @param string[] $output Array of HTML output for the dropdown. |
| 674 | * @param string[] $lang_files Array of available language files. |
| 675 | * @param string $current The current language code. |
| 676 | */ |
| 677 | $output = apply_filters( 'mu_dropdown_languages', $output, $lang_files, $current ); |
| 678 | |
| 679 | echo implode( "\n\t", $output ); |
| 680 | } |
| 681 | |
| 682 | /** |
| 683 | * Displays an admin notice to upgrade all sites after a core upgrade. |
| 684 | * |
| 685 | * @since 3.0.0 |
| 686 | * |