error:

I’m not finding any documentation on this error I’m getting all over with some codes, the error is special characters must be escaped : [ > ] .

this is the code

function cie_titre_page_commande()
{
    global $woocommerce;
    foreach($woocommerce->cart->get_cart() as $cart_item_key => $cart_item) {
        $product_id = $cart_item['product_id'];
        break;
    }
    
    if ($product_id == 32784) echo 'Offre Flexible';
    else if ($product_id == 19368) echo 'Plan fidèle - Annuel';
    else if ($product_id == 24421) echo 'Plan familial - Annuel';
    else if ($product_id == 19298) echo 'Plan découverte';
    else if ($product_id == 19349) echo 'Plan fidèle mensuel';
    else if ($product_id == 19346) echo 'Plan familial mensuel';
    else if ($product_id == 30918) echo 'évaluation orthopédagogique';
    else if ($product_id == 30920) echo 'évaluation orthophonique';
    else echo 'Page de commande';

}
add_shortcode('titre_commande', 'cie_titre_page_commande');