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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 |
|---|---|
| 589 | /** |
| 590 | * Filter the languages available in the dropdown. |
| 591 | * |
| 592 | * @since MU |
| 593 | * |
| 594 | * @param array $output HTML output of the dropdown. |
| 595 | * @param array $lang_files Available language files. |
| 596 | * @param string $current The current language code. |
| 597 | */ |
| 598 | $output = apply_filters( 'mu_dropdown_languages', $output, $lang_files, $current ); |
| 599 | echo implode( "\n\t", $output ); |
| 600 | } |
| 601 | |
| 602 | function site_admin_notice() { |
| 603 | global $wp_db_version; |
| 604 | if ( !is_super_admin() ) |
| 605 | return false; |
| 606 | if ( get_site_option( 'wpmu_upgrade_site' ) != $wp_db_version ) |
| 607 | echo "<div class='update-nag'>" . sprintf( __( 'Thank you for Updating! Please visit the <a href="%s">Upgrade Network</a> page to update all your sites.' ), esc_url( network_admin_url( 'upgrade.php' ) ) ) . "</div>"; |