get_category_link not working?

where did you define $category_id ?

The goal is to find a way to get the link of the category belonging to a post.

that is what <?php the_category(', '); ?> does perfectly;
can you describe why you can’t/won’t use that function?

Oh yeah, failed to copy the whole code…

The problem is now found, yet not the solution.

It would be ideal to use <?php the_category(', '); ?> if it was possible to change the title output:

<a href="<?php the_category(', '); ?>" title="Category Source">/Category Source/</a>

Which it doesn’t want to.

failed to copy the whole code…

please paste the full code into a https://pastebin.com/ and post the link to it here.

example code for getting the categories of a post as links, separated by a space:

<?php $cats = get_the_category($post->ID);
foreach( $cats as $cat ) { ?>
<a href="<?php echo get_category_link($cat->term_id); ?>"><?php echo $cat->name; ?></a>
<?php } ?>

Thanks, that worked out great!

Modified it a bit:

<?php $ep_cats = get_the_category($post->ID);
foreach( $ep_cats as $ep_cat ) { ?>
<a href="<?php echo get_category_link($ep_cat->term_id); ?>" title="<?php $ep_cat->name; ?>">/Category Source/</a> -|
<?php } ?>

For the other code, from before:

<?php
    // Get the ID of a given category
    $category_id = get_cat_ID( 'Category Name' );

    // Get the URL of this category
    $category_link = get_category_link( $category_id );
?>

<!-- Print a link to this category -->
<a href="<?php echo $category_link; ?>" title="Category Name">Category Name</a>

From the WordPress codex. As you can see, it relies on a category id, which get_the_category($post->ID) would have worked, I think…

Well, thank you again–for your help!

Suffice, thanks for posting your solution, not everyone does.