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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 |
|---|---|
| 12 | * Update the last_updated field for the current blog. |
| 13 | * |
| 14 | * @since MU |
| 15 | */ |
| 16 | function wpmu_update_blogs_date() { |
| 17 | global $wpdb; |
| 18 | |
| 19 | update_blog_details( $wpdb->blogid, array('last_updated' => current_time('mysql', true)) ); |
| 20 | |
| 21 | do_action( 'wpmu_blog_updated', $wpdb->blogid ); |
| 22 | } |
| 23 | |
| 24 | /** |
| 25 | * Get a full blog URL, given a blog id. |
| 26 | * |
| 27 | * @since MU |
| 28 | * |
| 29 | * @param int $blog_id Blog ID |
| 30 | * @return string |