function get_buy_cost($id = false)
{
$id or $id = $this->get_id();
$db = new db_alloc();
$q = prepare("SELECT amount, currencyTypeID, tax\n FROM productCost\n WHERE isPercentage != 1\n AND productID = %d\n AND productCostActive = true\n ", $id);
$db->query($q);
while ($row = $db->row()) {
if ($row["tax"]) {
list($amount_minus_tax, $amount_of_tax) = tax($row["amount"]);
$row["amount"] = $amount_minus_tax;
}
$amount += exchangeRate::convert($row["currencyTypeID"], $row["amount"]);
}
return $amount;
}
<?php
//Note: the & in front of $salary causes the variable to be passed as a reference
//function tax($salary) {
function tax(&$salary)
{
$salary = $salary - 500;
//$salary -= 500;
return $salary;
}
$salary = 2500;
echo tax($salary);
echo "<br>{$salary}";
