WordPress at a glance
function is not described

gzip_compression() WP 1.0

Deprecated in 2.5.0. It is no longer supported and can be removed in future releases. It is recommended to replace this function with the same one.

Unused function.

No Hooks.

Return

Nothing (null).

Usage

gzip_compression();

Code of gzip compression: wp-includes/deprecated.php WP 5.2.1

<?php
function gzip_compression() {
	_deprecated_function( __FUNCTION__, '2.5.0' );
	return false;
}