Adding elements from an array to a sql query in PHP - php

Question

I'm trying to put an array with values returned from a function to a sql query in PHP. Looking for information on how to do this, I tried to change the format of the array with the parameters fetch_assoc and fetch array, but it didn't help. I also tried to do a foreach loop for this array and execute sql with each iteration, but it also didn't do anything. How can I do this ?
This is my function which returns me an array of values:
public static function getLilanteProductCategoryForEmpik() {
$returnedArray = [];
$pdo = PDOConnector::getConnection();
echo $query = "SELECT product_type FROM `shopifyProductsLilante`
INNER JOIN offers_import_error_report_3839_14794292
WHERE shopifyProductsLilante.sku=offers_import_error_report_3839_14794292.sku";
$stmt = $pdo->prepare($query);
$stmt->execute( );
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
$returnedArray[] = $row;
}
var_dump($returnedArray);
return $returnedArray;
}
and this is the function where I want to put the values from the array in the sql query:
public static function getEmpikCategoryToCSVFile() {
$returnedArray = [];
$lilanteProductCategory = MysqlProvider::getLilanteProductCategoryForEmpik();
$pdo = PDOConnector::getConnection();
foreach($lilanteProductCategory as $lilanteCategory)
{
echo $query = "SELECT empik_category FROM `empik_categories` INNER JOIN shopifyProductsLilante
WHERE $lilanteCategory=empik_categories.lilante_category";
}
$stmt = $pdo->prepare($query);
$stmt->execute( );
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
$returnedArray[] = $row;
}
print_r($returnedArray);
return $returnedArray;
}