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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 |
|---|---|
| 2399 | */ |
| 2400 | function get_space_used() { |
| 2401 | /** |
| 2402 | * Filters the amount of storage space used by the current site. |
| 2403 | * |
| 2404 | * @since 3.5.0 |
| 2405 | * |
| 2406 | * @param int|bool $space_used The amount of used space, in megabytes. Default false. |
| 2407 | */ |
| 2408 | $space_used = apply_filters( 'pre_get_space_used', false ); |
| 2409 | if ( false === $space_used ) { |
| 2410 | $upload_dir = wp_upload_dir(); |
| 2411 | $space_used = get_dirsize( $upload_dir['basedir'] ) / MB_IN_BYTES; |
| 2412 | } |
| 2413 | |
| 2414 | return $space_used; |
| 2415 | } |
| 2416 | |
| 2417 | /** |