How to create a dynamic variable

Occasionally a feed needs logic that conditions and filters cannot express - a lookup against another table, a calculation with real branching, a format only you know the rules for.

A dynamic variable is the escape hatch: a small PHP script on your server that you can call from any feed template like a normal attribute. When the built-in tools run out, this is what is left, and it can do anything PHP can.

Create a new dynamic variable

1. Create a new variable in Magento

• Navigate to Catalog -> Advanced Product Feeds -> Dynamic variables.
• Click Add New Variable and fill in the following fields:
  • Set the name of the variable.
  • Set the unique identifier for the variable (used in feed templates).

2. Add PHP code for the variable

• Log in to your Magento server.

• Navigate to one of the following directories:

  • var/mst_feed/
  • app/code/Mirasvit/Feed/ (recommended for Magento Cloud)

• Create a new PHP file with the exact name as the variable code.

  Example

  If the Variable Code is gtin_variable, create var/mst_feed/gtin_variable.php.

• Write your PHP code inside the file.

Note

Use echo instead of return to output the value.

3. Validate and Use the Variable*

• Save the variable and reload the Magento admin page.
• The code section will display the PHP script fetched from the server.
• To test the variable, enter product IDs in the preview field.
• Use the variable in templates with:

  {{ product.variable:your_variable_code }}

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Example of dynamic variables

Get correct GTIN

Name: GTIN
Code: gtin
PHP code:

<?php
$gtin = $product->getGtin();
if (!$gtin) {
    $gtin = $product->getId();
    $gtin .= str_repeat('0', 12 - strlen($gtin));
}
echo $gtin;
?>

Usage in feed template:

{{ product.variable:gtin }}

Output:

124200000000

Add 20% to the final price

Name: Add percentage
Code: percentage
PHP code:

<?php
$price = $product->getFinalPrice();
echo number_format($price * 1.2, 2);
?>

Usage in feed template:

{{ product.variable:percentage }}

Get total stock quantity across all sources

Name: Summary stocks qty
Code: sum_stocks_qty
PHP code:

<?php
$sourcesData = $objectManager->get('\Magento\InventoryCatalogAdminUi\Model\GetSourceItemsDataBySku')
    ->execute($product->getSku());

$sumQty = 0;

foreach ($sourcesData as $sourceData) {
    $sumQty += $sourceData['quantity'];
}

echo $sumQty;

Usage in feed template:

{{ product.variable:sum_stocks_qty }}

Display special price only if it's lower than regular price

Name: Custom special price
Code: custom_spec_price
PHP Code:

<?php
$finalPrice = $product->getFinalPrice();
$regularPrice = $product->getPrice();

if ($finalPrice < $regularPrice) {
    echo number_format($finalPrice, 2);
} else {
    echo '';
}
?>

Usage in feed template:

{{ product.variable:custom_spec_price }}