php - How to use echo inside echo

Question

I Have this code:

echo '<form method="post" class="product" action="index.php" id="addtocartproduct<?php echo $products->virtuemart_product_id ?>">';

I have to use echo inside echo and again I have to never use php in this line. haw can I edit this line and make it like:

echo '<form method="post" class="product" action="index.php" id="addtocartproduct echo $products->virtuemart_product_id ">';

EDIT: thanks every one for very useful help. now I have another problem.what can i do with this line:

echo'<input type="hidden" class="pname" value="<?php echo $product->product_name ?>">';

Answer 1

echo '<form method="post" class="product" action="index.php" id="addtocartproduct '. $products->virtuemart_product_id.' ">';