adding null coalescing operator for rtrim function to avoid deprecation

[asifmuztaba]

There was a warning showing

Deprecated: rtrim(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/wordpress/wordpress/wp-includes/formatting.php on line 2872

The rtrim function 1st parameter value as null is deprecated in php 8.1. It can be fixed by adding

null coalescing

operator.

function untrailingslashit( $string ) {
	return rtrim( $string ?? '', '/\\' );
}

[asifmuztaba]

Warning Screenshot

[ocean90]

Hello @asifmuztaba, welcome to WordPress Trac! Thanks for the report, this has been fixed in [54349] already. Marking as a duplicate of #54997 and #55967.