Woocommerce Multi Affiliate Links Extension

<?php

// Display Fields
add_action( 'woocommerce_product_after_variable_attributes', 'variable_fields', 10, 2 );
//JS to add fields for new variations
add_action( 'woocommerce_product_after_variable_attributes_js', 'variable_fields_js' );
// Save Fields
add_action( 'woocommerce_save_product_variation', 'variable_fields_process', 10, 2 );

function variable_fields( $loop, $variation_data ) {
?>  
    <tr>
        <td>
            <div>
                    <label><?php _e( 'Affiliate URL', 'woocommerce' ); ?></label>
                    <input type="text" size="5" name="my_affiliate_url[<?php echo $loop; ?>]" value="<?php echo $variation_data['_my_affiliate_url'][0]; ?>"/>

            </div>
        </td>
    </tr>
<?php
}

function variable_fields_js() {
?>
<tr>
        <td>
            <div>
                    <label><?php _e( 'My Custom Field', 'woocommerce' ); ?></label>
                    <input type="text" size="5" name="my_affiliate_url[' + loop + ']" />
            </div>
        </td>
    </tr>
<?php
}

function variable_fields_process( $post_id ) {
    if (isset( $_POST['variable_sku'] ) ) :
        $variable_sku = $_POST['variable_sku'];
        $variable_post_id = $_POST['variable_post_id'];
        $variable_custom_field = $_POST['my_affiliate_url'];
        for ( $i = 0; $i < sizeof( $variable_sku ); $i++ ) :
            $variation_id = (int) $variable_post_id[$i];
            if ( isset( $variable_custom_field[$i] ) ) {
                update_post_meta( $variation_id, '_my_affiliate_url', stripslashes( $variable_custom_field[$i] ) );
            }
        endfor;
    endif;
}

//front-end variations
function woocommerce_variable_add_to_cart() {
        global $product, $post;
        $variations = $product->get_available_variations();
        foreach ($variations as $key => $value) {
        ?>
        <form action="<?php echo esc_url( $product->add_to_cart_url() ); ?>"method="post" enctype='multipart/form-data'>
            <input type="hidden" name="variation_id" value="<?php echo $value['variation_id']?>" />
            <input type="hidden" name="product_id" value="<?php echo esc_attr( $post->ID ); ?>" />
            <?php
            if(!empty($value['attributes'])){
                foreach ($value['attributes'] as $attr_key => $attr_value) {
                ?>
                <input type="hidden" name="<?php echo $attr_key?>" value="<?php echo $attr_value?>">
                <?php
                }
            }
            ?>
            <table>
                <tbody>
                    <tr>
                        <td>
                            <b><?php echo implode('/', $value['attributes']);?></b>
                        </td>
                        <td>
                            <?php echo $value['price_html'];?>
                        </td>
                        <td>
 <a class="single_add_to_cart_button button alt" target="_blank" href="<?php echo get_post_meta($value['variation_id'], '_my_affiliate_url', true); ?>" >
<?php echo apply_filters('single_add_to_cart_text', __( 'Add to cart', 'woocommerce' ), $product->product_type); ?></a>
                        </td>
                    </tr>
                </tbody>
            </table>
        </form>
        <?php
        }
}

?>

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