Display custom prefix with price per meter on WooCommerce products

Question

I'm using this code to add text below the price of my products

function cw_change_product_price_display( $price ) {
    $price .= ' <span class="unidad">por unidad</span>';
    return $price;
}
add_filter( 'woocommerce_get_price_html', 'cw_change_product_price_display' );
add_filter( 'woocommerce_cart_item_price', 'cw_change_product_price_display' );

But I need to display the following text: Price per meter is: and this formula:

$product->get_price()/$product->get_length() . get_woocommerce_currency_symbol();

Product price divided product length, can't get it to work without causing a error in the site.

Also, Is there any way to make this code apply to only certain products? As there are many that are sold per unit

Answer 1

You can use it this way for your simple products:

add_filter( 'woocommerce_get_price_html', 'custom_product_price_display', 10, 2 );
add_filter( 'woocommerce_cart_item_price', 'custom_product_price_display', 10, 2 );
function custom_product_price_display( $price, $product ) {
    if( ! is_a( $product, 'WC_Product' ) ) {
        $product = $product['data'];
    }
    
    // Price per meter prefixed
    if( $product->is_type('simple') && $product->get_length() ) {
        $unit_price_html = wc_price( $product->get_price() / $product->get_length() );
        $price .= ' <span class="per-meter">' . __("Price per meter is: ") . $unit_price_html . '</span>';
    } 
    return $price;
}

Code goes in functions.php file of your active child theme (or active theme). Tested and works.

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To handle both "the displayed price per meter" and the prefix "per unit", use the following instead:

add_filter( 'woocommerce_get_price_html', 'custom_product_price_display', 10, 2 );
add_filter( 'woocommerce_cart_item_price', 'custom_product_price_display', 10, 2 );
function custom_product_price_display( $price, $product ) {
    if( ! is_a( $product, 'WC_Product' ) ) {
        $product = $product['data'];
    }
    
    // Price per meter prefixed
    if( $product->is_type('simple') && $product->get_length() ) {
        $unit_price_html = wc_price( $product->get_price() / $product->get_length() );
        $price .= ' <span class="per-meter">' . __("Price per meter is: ") . $unit_price_html . '</span>';
    } 
    // Prefix" per unit"
    else {
        $price .= ' <span class="per-unit">' . __("per unit") . $unit_price_html . '</span>';
    }
    return $price;
}