Question

To start, I’m still a noob with php, and much of what I’ve learned is from problems being solved across this site that I have also had myself.

I’ve found the answers here for all of my original questions, but when I put them all together I can’t get get the code to work.

I have a basic form that is posting to itself using PHP_SELF. I want all input from the $_POST array to be checked to make sure that it is (1) a positive integer, (2) a whole number, and (3) does not include a decimal.

if( !empty($_POST ) ) {
    foreach( $_POST as $key => $amount ) {
        if( !is_int($amount) || $amount < 0 || is_float(amount) ) {
            die( 'All data must be positive integers.' );
        }
    }
}

No matter what I type into any of the input fields it always returns the “die” error.

Answer 1

$amount is a string so is_int will always fail, try filter_var instead

if( !empty($_POST ) ) {
    $options = array(
        'options' => array(
            'min_range' => 0
        )
    );
    foreach( $_POST as $key => $amount ) {
        if( filter_var($amount, FILTER_VALIDATE_INT, $options) === false ) {
            die( 'All data must be positive integers.' );
        }
    }
}