RpcApi.php

<?php

function validateProducts($storeData) {

    // Check to make sure that our valid fields are in there
    $requiredFields = array(
        'price',
        'name',
        'description',
        'type',
    );
    
    $valid = true;

    foreach ($storeData['products'] as $rawProduct) {
	
        $fields = array_keys($rawProduct);
    
    	foreach ($requiredFields as $requiredField) {
            if (!in_array($requiredField, $fields)) {
                $valid = false;
            }
        }
    }

    return $valid;
}
?>

// ---------------- REWRITTEN

<?php

function validateProductList($storeData)
{
    $validatedProductList = array_filter($storeData['products'], 'validateProduct');
    
    // If the amount of products differ from validated products, one of them failed
    return (count($storeData['products']) === count($validatedProductList));
}

function validateProduct($rawProduct)
{
    $requiredFields = array(
        'price', 'name', 'description', 'type'
    );

    $fields = array_keys($rawProduct);
    $missingFields = array_diff($requiredFields, $fields);
    
    return (count($missingFields) === 0);
}