Here is an example of a PHP code for a WordPress plugin that would automatically convert any Amazon.com links into links that use your affiliate code:

```php
<?php
/*
Plugin Name: Amazon Affiliate Link Converter
Description: Automatically converts Amazon links to affiliate links using your affiliate code.
*/

function convert_amazon_links($content) {
    $amazon_url_pattern = "/https?:\/\/(www\.)?amazon\.com\/([a-zA-Z0-9\/\-]+)(\?[a-zA-Z0-9&=\+\%\.\-\_]+)?/i";
    $affiliate_url = "https://www.amazon.com/gp/product/%product_id%/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=%product_id%&linkCode=as2&tag=%affiliate_id%";

    preg_match_all($amazon_url_pattern, $content, $matches);

    if (count($matches[0]) > 0) {
        foreach ($matches[0] as $match) {
            $product_id_pattern = "/\/dp\/([A-Za-z0-9]+)/i";
            preg_match($product_id_pattern, $match, $product_id_match);
            $product_id = $product_id_match[1];

            $affiliate_link = str_replace("%product_id%", $product_id, $affiliate_url);
            $affiliate_link = str_replace("%affiliate_id%", "your-affiliate-id", $affiliate_link);

            $content = str_replace($match, $affiliate_link, $content);
        }
    }

    return $content;
}

add_filter('the_content', 'convert_amazon_links');
?>
```

To implement this code as a plugin, you would need to do the following:

1. Create a new folder in the WordPress plugins directory with a name of your choosing.
2. Create a new PHP file inside the folder and copy the code above into it.
3. Replace "your-affiliate-id" with your actual Amazon affiliate ID.
4. Save the file and upload the entire folder to the WordPress plugins directory.
5. Activate the plugin from the WordPress dashboard.
6. Once the plugin is activated, it will automatically convert any Amazon.com links in your content to affiliate links using your affiliate code.
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