Create a function to customise meta keywords and description

Can someone help me create a function….Please….

I want to turn some php code into a function so i can include it within functions.php . Could someone please help me out..

The aim is to have totally customised keyword metadata and I’m sure this would work.

I would personally call the function something like ” statickeywords ” or similar.

Using my chosen method I would have a function for each separate set of keyword metadata so I can use it for specific pages and call for it by … say number i.e. statuckeywords1, statuckeywords2, statuckeywords3 etc as the name for each function so i can then call for the function in the header.php and have custom metadata. This
would mean I can customise each page individually for maximum optimisation of keywords and description meta.

To Clarify I want to turn the following code into a function so i can call for it later. This code will be used to display custom keywords (and description) within a page’s metadata.

I will check what the page is via requesting the url or using the built in wordpress metatags to then display customised meta keywords and description.

Code :

<!-- start tags for keywords -->
<meta name="keywords" content="<?php if(is_single() || is_page() || is_category() || is_tag() || is_archive() || is_paged() || the_post()) {
			$metatags = get_the_tags($post->ID);
			foreach ($metatags as $tagpost) {
				$mymetatag = apply_filters('the_tags',$tagpost->name);
				$keyword = utf8_decode($mymetatag); // Your filters...
				echo $keyword.",";
			}
		}
		?><?php the_title(); ?>,Here,go,the,rest,of,my keywords,thanks for helping" />

This code outputs the keyword tags seperated by commas then outputs the page title using the_title(); then outputs the remaining specified keywords.

I want to keep the tags in my keywords at all times, and perhaps the page title, but would like to be able to adjust all the other ‘remaining’ keywords. I believe the method i have chosen will work well, but it’s probably a bit of a long way around things. If any one has an alternative suggestion I’d like to hear from you.