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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 |
|---|---|
| 850 | |
| 851 | /** |
| 852 | * Filters the upload base directory to delete when the site is deleted. |
| 853 | * |
| 854 | * @since MU (3.0.0) |
| 855 | * |
| 856 | * @param string $uploads['basedir'] Uploads path without subdirectory. @see wp_upload_dir() |
| 857 | * @param int $site_id The site ID. |
| 858 | */ |
| 859 | $dir = apply_filters( 'wpmu_delete_blog_upload_dir', $uploads['basedir'], $site->id ); |
| 860 | $dir = rtrim( $dir, DIRECTORY_SEPARATOR ); |
| 861 | $top_dir = $dir; |
| 862 | $stack = array( $dir ); |
| 863 | $index = 0; |
| 864 | |
| 865 | while ( $index < count( $stack ) ) { |
| 866 | // Get indexed directory from stack. |
| 867 | $dir = $stack[ $index ]; |
| 868 | |