I want to check if every value in $stock is higher than the value with the same index in $request.
$stock = array("7", "5", "3");
$request = array("3", "6", "3");
In this case, the second $request value is higher than stock value (6 vs 5) -- so there is insufficient stock.
How can I check if there are any values in $request that are higher than the respective value in $stock?
Simply loop through the arrays and compare the indexes in the respective arrays. Since it's a fixed length, always, there isn't need for any complex checks or handlings. This assumes that the keys are assigned by PHP, so they all start at 0 and always increase by 1.
$stock = array("7", "5", "3");
$request = array("3", "6", "3");
var_dump(validate_order($stock, $request)); // false
$stock = array("7", "5", "3");
$request = array("3", "4", "3");
var_dump(validate_order($stock, $request)); // true
function validate_order($stock, $request) {
foreach ($stock as $key=>$value) // Fixed length, loop through
if ($value < $request[$key])
return false; // Return false only if the stock is less than the request
return true; // If all indexes are higher in stock than request, return true
}
Since this function returns a boolean, true/false, simply use that in an if-statement, like this
if (validate_order($stock, $request)) {
/* Put your code here */
/* The order is valid */
} else {
/* Order is not valid */
}