php - Change links automatically to affiliate links

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My goal:

I want external links to shops I'm affiliated with (for example amazon) to automatically get the affiliate ID attached to it.

Example:

link I put in my blog post editor /

changes in frontend to /?tag=myafftag-02

What I have found:

The creator of the theme I'm using is offering something very close to what I'm looking for:

add_action('wpfepp_form_actions', 'link_change_custom');
function link_change_custom($data){
if ( !empty( $_POST['rehub_offer_product_url'] ) ) {

    $url = $_POST['rehub_offer_product_url'];

    $checkdomain = 'amazon';
    if (!empty($url) && strpos($url, $checkdomain) !== false) :

        $afftag = 'myafftag-02'; //our affiliate ID
        $affstring = 'tag='; // url parameter for affiliate ID

        if (parse_url($url, PHP_URL_QUERY)): //check if link has query string
            if (strpos($affstring, $url) !== false) : //check if link already has affiliate ID
                $url = preg_replace("/(".$affstring.").*?(\z|&)/", "$1".$afftag."$2", $url);
            else:
                $url = $url.'&'.$affstring.$afftag;
            endif;   
        else:
            $url = $url.'?'.$affstring.$afftag;
        endif;

    endif;  

    update_post_meta( $data['post_id'], 'rehub_offer_product_url', esc_url($url) );
}     
}

The problem:

It only works on links that are stored in the field "rehub_offer_product_url", but I want it to work on any links to amazon I put in the content of my blog posts.

I appreciate any help.

My goal:

I want external links to shops I'm affiliated with (for example amazon) to automatically get the affiliate ID attached to it.

Example:

link I put in my blog post editor https://www.amazon.com/dp/B07K344J3N/

changes in frontend to https://www.amazon.com/dp/B07K344J3N/?tag=myafftag-02

What I have found:

The creator of the theme I'm using is offering something very close to what I'm looking for:

add_action('wpfepp_form_actions', 'link_change_custom');
function link_change_custom($data){
if ( !empty( $_POST['rehub_offer_product_url'] ) ) {

    $url = $_POST['rehub_offer_product_url'];

    $checkdomain = 'amazon.com';
    if (!empty($url) && strpos($url, $checkdomain) !== false) :

        $afftag = 'myafftag-02'; //our affiliate ID
        $affstring = 'tag='; // url parameter for affiliate ID

        if (parse_url($url, PHP_URL_QUERY)): //check if link has query string
            if (strpos($affstring, $url) !== false) : //check if link already has affiliate ID
                $url = preg_replace("/(".$affstring.").*?(\z|&)/", "$1".$afftag."$2", $url);
            else:
                $url = $url.'&'.$affstring.$afftag;
            endif;   
        else:
            $url = $url.'?'.$affstring.$afftag;
        endif;

    endif;  

    update_post_meta( $data['post_id'], 'rehub_offer_product_url', esc_url($url) );
}     
}

The problem:

It only works on links that are stored in the field "rehub_offer_product_url", but I want it to work on any links to amazon I put in the content of my blog posts.

I appreciate any help.

• php
• functions
• url-rewriting
• redirect
• links

Share Improve this question asked Feb 3, 2020 at 20:54 AlinaAlina 2122 bronze badges

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2 Answers 2

Sorted by: Reset to default 0

The code you found works if you're using the Classic Editor. It takes POST data (as in, a POST HTTP request) and converts it before it enters the database. So, in addition to only updating a certain meta field, it also only works from the point you add the code forward. Any old links aren't affected.

Assuming you probably want to affect existing links as well as new ones, you can filter the_content instead. This will work in the Classic Editor too, but also with the Block Editor.

This should put you on the right path - you'll just need to work out the right regular expression to identify an Amazon link's query string. (If you already know that none of your Amazon links have query strings, you can skip the regular expression completely and just go ahead and do the str_replace() step.)

<?php
// Add a filter to `the_content`, which is called when pulling the post data out of the database
add_filter('the_content', 'wpse_357790_add_amazon_affiliate');
function wpse_357790_add_amazon_affiliate($content) {
    // See if "amazon.com" is found anywhere in the post content
    if(strpos($content, 'amazon.com') !== false) {
        // Capture all Amazon links and their query strings
        // TO DO: work out the correct regex here. This next line is not complete.
        preg_match_all('\?tag=[^&]+(&|")', $content, $matches);
        // Add the affiliate query string to each URL
        foreach($matches as $url) {
            $content = str_replace($url, $url . '?tag=myafftag-02', $content);
        }
    }
    // Always return the content, even if we didn't change it
    return $content;
}
?>

Benefits: will work with either editor, filters all post content, works on all content - already-published and not-yet-created.

I needed the same automatic capability on one of my sites: the need to change any Zon link to include my affiliate code, whether that was a link in a post, page, or comment. Couldn't find one that did that, so built my own plugin.

It's called "AmazoLinkenator" here https://wordpress.org/plugins/amazolinkenator/ . You can look at the code inside if you want to 'fork' it, of just use the plugin. (I note that I should change the 'tested to' value to 5.3; it works just fine in current WP version.) Support via the plugin page.

But, all you need is the proper regex to find/replace any Zon links. (I had to add code to also process shortened URLs.) There's about 80-100 lines of code to do the replace.

Plus, if you have a Bit.ly API code, it will shorten the URLs it finds. Only works on Zon URLs.

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