Redirect all posts when change permalinks structure

Hello,

Thanks for getting back to us and we regret the inconvenience due to the issue.

You can use the following code to redirect all the previous posts link automatically redirect to the new structure. Please put the code in your theme’s functions.php file. Also, I hope you have updated the structure in your permalink settings – https://i.rankmath.com/v9LLH4

add_action( 'template_redirect', function () {

	global $wp;

	$post_id = get_posts(
		array(
			'name'        => $wp->request,
			'post_type'   => 'post',
			'post_status' => 'publish',
			'numberposts' => 1,
			'fields'      => 'ids',
		)
	);
	$post_id = reset( $post_id );

	if ( $post_id && ! empty( $permalink = get_the_permalink( $post_id ) ) ) {
		wp_safe_redirect( $permalink );
		exit();
	}
} );

If you require any further assistance don’t hesitate to get in touch. Thanks