Hi,
I have a wordpress blog with hundreds pages.
I want to add affiliate link under my post description on these pages?
I feel I can add instantly maybe at index.php or page.php etc.
But I dont know the code or where to put.
Can you help me?
Thank you very much for your advance.

I am not familar with the files or structure of wordpress but I assume you will have to add this into a template file, most likely one of the files included into your index.php or the file that is used to render your pages that feature the post description.

Yes, I think must any code to integrate this feature instantly on wordpress post.
More than thank you if you can help me.

It does depend on your theme structure as for where to put the content.

Your posts are generated with single.php.
Your page theme is page.php
Many sites will use index.php for multiple purposes.

You would add these affiliate links manually after you see:

PHP Code:

<?php the_content(); ?>

However, IMO, I would add that through hooking into WP because you could actually have multiple page templates, etc. Then it will be added to any content. Still a lot to manage.

Paste this code into your functions.php file.(You most likely have this file already in your theme. If not just create it.) Obviously, put your link info where I have "Affiliate links".

PHP Code:

function add_post_content($content) {
    if(!is_feed() && !is_home()) {
        $content .= '<p>Affiliate links here</p>';
    }
    return $content;
}
add_filter('the_content', 'add_post_content'); 


(from this source)

Hi Racer X,
More than thank you. Finally...
But the code not at function.php, but at single.php.
As you said, this depends my theme.
And everything so okay.
Thank you very much
You great..!

You are welcome.

Placing that code in the actual single.php file kind of defeats the purpose of using a hook but, hey, as long as it works for you.

The beauty of using hooks in WP means you don't have to edit template files(usually) directly that make up a page view. By placing that same code in the functions.php file, it would have automatically added it in the same manner.

This would have been done more easily with an update query via phpmyadmin.

UPDATE wp_posts SET post_content = CONCAT(post_content,'<p><a href="#">Affilliate Link</a><p>')

This would have been done more easily with an update query via phpmyadmin.

I am not understanding how that would have affected future posts?

By using a wp content filter, it not only affects the existing posts, but will be added to all future posts and can be changed/managed in one simple file(even from the admin area) rather than going into phpmyadmin every time.

Plus, I am guessing Edwin may not want to be digging into his database like that which is not really advisable as you know unless you are very comfortable doing so.

Just my opinion however.