troubleshooting Question

PHP form textbox validation

Avatar of mrooneyafdo
mrooneyafdo asked on
PHP
4 Comments1 Solution4040 ViewsLast Modified:
I have a textbox on an order page. The user enters the quantity of the item that they want to buy, and then clicks an order button. What I want is a way to detect if it is an integer and at least 1.

$ValidInt = 0;
if ($quant > 0) // I was hoping any string would not pass this, though I think I am incorrect.
{
    if (is_int($quant))
    {
     $ValidInt = 1;
    }
}

That was my original attempt, but it does not seem to work. If the user enters a string or any combination of letters and numbers, then of course $ValidInt should remain 0. If it is a decimal, it should also remain zero. Finally, it must be at least 1. That is what I tried to accomplish, in a few different ways, the above seemed to be my best effort. Thanks!
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