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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 |
|---|---|
| 1935 | /** |
| 1936 | * Returns the space used by the current blog. |
| 1937 | * |
| 1938 | * @since 3.5.0 |
| 1939 | * |
| 1940 | * @return int Used space in megabytes |
| 1941 | */ |
| 1942 | function get_space_used() { |
| 1943 | // Allow for an alternative way of tracking storage space used |
| 1944 | $space_used = apply_filters( 'pre_get_space_used', false ); |
| 1945 | if ( false === $space_used ) { |
| 1946 | $upload_dir = wp_upload_dir(); |
| 1947 | $space_used = get_dirsize( $upload_dir['basedir'] ) / 1024 / 1024; |
| 1948 | } |
| 1949 | |
| 1950 | return $space_used; |
| 1951 | } |
| 1952 | |
| 1953 | /** |