How Do I Output Multiselect Attribute Values In Magento 2.3.x? - magento

Question

In a Magento 2.3.3 store I am trying to ouput the values of a multiselect custom attribute on a category page, but not having any luck.
I have set the attribute to be used in product listing and tried to output it on catalog/product/listing.phtml template page in my custom theme.
I am using the using the following code:
<?php /* #escapeNotVerified */ echo $_product->getResource()->getAttribute('custom_attribute')->getFrontend()->getValue($_product); ?>
This is working for dropdown attributes but not multi select attributes.
Kind of stuck on this...

Answer 1

You can use the below code to get MultiSelect Attribute value
create block in "catalog_product_view.xml"
<referenceBlock name="product.info.main">
<block class="Magento\Catalog\Block\Product\View" name="attribue.name" template="Magento_Catalog::product/view/attribute_name.phtml" after="-" />
</referenceBlock>
create "phtml" file under "Magento_Catalog::product/view/attribute_name.phtml"
<?php $product = $block->getProduct(); ?>
<div>
<?php
$data = explode(',',$product->getData('attribute_code'));
foreach($data as $value):
?>
<?php
$attr = $product->getResource()->getAttribute('attribute_code');
if ($attr->usesSource()):
?>
<?php
$option_value = $attr->getSource()->getOptionText($value);
?>
<p><?php echo $option_value; ?></p>
<?php endif;?>
<?php endforeach;?>
</div>

Answer 2

Here is an example of a code that returns "Multiselect Attribute Values". The attribute belongs to product entity. As it isn't a good idea to get ProductResource model from ProductModel and taking into account that probably you need to get it inside some template, just create a ViewModel and use this example there.
use Magento\Catalog\Model\ResourceModel\Product as ProductResource;
...
public function __construct(
...
ProductResource $productResource
)
{
...
$this->productResource = $productResource;
}
public function prepareProductAttributeOptions($product, $attributeCode)
{
$result = [];
$data = $product->getData($attributeCode);
$optionsIds = [];
if ($data) {
$optionsIds = explode(',', $data);
}
foreach ($optionsIds as $optionId) {
$attr = $this->productResource->getAttribute($attributeCode);
if ($attr->usesSource()) {
$option_value = $attr->getSource()->getOptionText($optionId);
$result[] = $option_value;
}
}
return implode(',', $result);
}