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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 |
|---|---|
| 1893 | /** |
| 1894 | * Returns the space used by the current blog. |
| 1895 | * |
| 1896 | * @since 3.5.0 |
| 1897 | * |
| 1898 | * @return int Used space in megabytes |
| 1899 | */ |
| 1900 | function get_space_used() { |
| 1901 | // Allow for an alternative way of tracking storage space used |
| 1902 | $space_used = apply_filters( 'pre_get_space_used', false ); |
| 1903 | if ( false === $space_used ) { |
| 1904 | $upload_dir = wp_upload_dir(); |
| 1905 | $space_used = get_dirsize( $upload_dir['basedir'] ) / 1024 / 1024; |
| 1906 | } |
| 1907 | |
| 1908 | return $space_used; |
| 1909 | } |
| 1910 | |
| 1911 | /** |