How do I check if a product is configurable

Question

Does someone know how to check if a product is configurable ?

I want my configurable products to say 'From:' in front of the price on the product list page.

Answer 1

From the question it is not clear for which version you want to check still I am adding answer,

For M2 you can check like this,

if($product->getTypeId() == \Magento\ConfigurableProduct\Model\Product\Type\Configurable::TYPE_CODE){
          echo "product is configurable";
}

Where $product is \Magento\Catalog\Model\Product object

---

For M1 you can check like this,

if($product->getTypeId() == Mage_Catalog_Model_Product_Type_Configurable::TYPE_CODE){
          echo "product is configurable";
}

Where $product is Mage_Catalog_Model_Product object

Answer 2

For configurable product check product type ID using simple code.

if($_product->getTypeId() == 'configurable'){
     echo 'This is a configurable product';
}else{
     echo 'This is not a configurable product';
}

Thanks

Answer 3

For M1 you can use:

/* Mage_Catalog_Model_Product */
if ($product->isConfigurable()) {
    ...
}