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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 |
---|---|
717 | /** |
718 | * Filters the languages available in the dropdown. |
719 | * |
720 | * @since MU (3.0.0) |
721 | * |
722 | * @param string[] $output Array of HTML output for the dropdown. |
723 | * @param string[] $lang_files Array of available language files. |
724 | * @param string $current The current language code. |
725 | */ |
726 | $output = apply_filters( 'mu_dropdown_languages', $output, $lang_files, $current ); |
727 |
|
728 | echo implode( "\n\t", $output ); |
729 | } |
730 |
|
731 | /** |
732 | * Displays an admin notice to upgrade all sites after a core upgrade. |
733 | * |
734 | * @since 3.0.0 |
735 | * |