wp-includes/ms-functions.php:2702Filters the maximum upload file size allowed, in bytes.
$sizeintintfunction upload_size_limit_filter( $size ) { $fileupload_maxk = (int) get_site_option( 'fileupload_maxk', 1500 ); $max_fileupload_in_bytes = KB_IN_BYTES * $fileupload_maxk; if ( get_site_option( 'upload_space_check_disabled' ) ) { return min( $size, $max_fileupload_in_bytes ); } return min( $size, $max_fileupload_in_bytes, get_upload_space_available() );}Introduced in 3.0.0. 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.