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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 |
|---|---|
| 2522 | */ |
| 2523 | function get_space_used() { |
| 2524 | /** |
| 2525 | * Filters the amount of storage space used by the current site, in megabytes. |
| 2526 | * |
| 2527 | * @since 3.5.0 |
| 2528 | * |
| 2529 | * @param int|false $space_used The amount of used space, in megabytes. Default false. |
| 2530 | */ |
| 2531 | $space_used = apply_filters( 'pre_get_space_used', false ); |
| 2532 | |
| 2533 | if ( false === $space_used ) { |
| 2534 | $upload_dir = wp_upload_dir(); |
| 2535 | $space_used = get_dirsize( $upload_dir['basedir'] ) / MB_IN_BYTES; |
| 2536 | } |
| 2537 | |
| 2538 | return $space_used; |
| 2539 | } |
| 2540 | |