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upload_size_limit_filter( int $size )

Filters the maximum upload file size allowed, in bytes.

Parameters

$size

(int) (Required) Upload size limit in bytes.

Return

(int) Upload size limit in bytes.

Source

File: wp-includes/ms-functions.php 

function upload_size_limit_filter( $size ) {
	$fileupload_maxk = KB_IN_BYTES * get_site_option( 'fileupload_maxk', 1500 );
	if ( get_site_option( 'upload_space_check_disabled' ) ) {
		return min( $size, $fileupload_maxk );
	}

	return min( $size, $fileupload_maxk, get_upload_space_available() );
}

Uses

Uses Description
wp-includes/option.php: get_site_option()

Retrieve an option value for the current network based on name of option.
wp-includes/ms-functions.php: get_upload_space_available()

Determines if there is any upload space left in the current blog’s quota.

Changelog

Version Description
3.0.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/upload_size_limit_filter