Create a function with optional arguments in PHP

Description

The following code shows how to create a function with optional arguments.

Example

<?php/* w  w w .  j a v a 2  s.co  m*/

function calcSalesTax($price, $tax="") 
{
    $total = $price + ($price * $tax);
    echo "Total cost: $total";
}

calcSalesTax(42.00);

?>

The code above generates the following result.