wp-includes/ms-functions.php:2589Returns the space used by the current site.
intOne hook fires while get_space_used() runs, in this order:
Filters the amount of storage space used by the current site, in megabytes.
function get_space_used() { /** * Filters the amount of storage space used by the current site, in megabytes. * * @since 3.5.0 * * @param int|false $space_used The amount of used space, in megabytes. Default false. */ $space_used = apply_filters( 'pre_get_space_used', false ); if ( false === $space_used ) { $upload_dir = wp_upload_dir(); $space_used = get_dirsize( $upload_dir['basedir'] ) / MB_IN_BYTES; } return $space_used;}Introduced in 3.5.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/ms-functions.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.