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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.
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824 |
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825 | /** |
826 | * Filters the upload base directory to delete when the site is deleted. |
827 | * |
828 | * @since MU (3.0.0) |
829 | * |
830 | * @param string $uploads['basedir'] Uploads path without subdirectory. @see wp_upload_dir() |
831 | * @param int $site_id The site ID. |
832 | */ |
833 | $dir = apply_filters( 'wpmu_delete_blog_upload_dir', $uploads['basedir'], $site->id ); |
834 | $dir = rtrim( $dir, DIRECTORY_SEPARATOR ); |
835 | $top_dir = $dir; |
836 | $stack = array( $dir ); |
837 | $index = 0; |
838 |
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839 | while ( $index < count( $stack ) ) { |
840 | // Get indexed directory from stack |
841 | $dir = $stack[ $index ]; |
842 |
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