In what scenarios would it be unnecessary or redundant to store certain data values in a database using PHP?

It would be unnecessary or redundant to store certain data values in a database using PHP if the data is temporary, does not need to be persisted, or can be easily recalculated or retrieved from an external source. In these cases, storing the data in a database would add unnecessary complexity and overhead.

// Example of not storing temporary data in a database
$temporaryData = "This is temporary data";

// Example of recalculating data instead of storing it in a database
$price = 10;
$quantity = 5;
$total = $price * $quantity;
echo "Total: " . $total;