Question

I am currently validating US Currency along with a decimal number format. I am using the function money_formatbut the issues is that certain values is returning an error.

How can i have the function work when the input value is 0.00 or 0.50? Example

PHP

if (isset($_POST['price'])){
    $price = $_POST['price'];
    $priceString = empty($price['price'])?null:trim($price['price']);
        if(!empty($priceString)) { 
            $price = str_replace("$", "", $price); 
                if  (preg_match('/^[+\-]?\d+(\.\d+)?$/', $price)){
                 echo ('<div id="price"><span id="resultval"><h2>Price:</h2>'.money_format('%n', $price).'</span></div>');
                           }
                     else {
             echo ('<div id="price"><span id="resultval"><h2>Price:</h2><div class="errorMessage">Enter a valid number in US currency format.</div></span></div>'); 
                           }
}
            else {
            echo '';
            }
}

Answer 1

The error is here:

$price = $_POST['price'];
$priceString = empty($price['price'])?null:trim($price['price']);

Note that that $price is a String; so, $price['price'] returns the first character of that array because the interpreter should logically attempt $price[intval('price')] where intval('price') == 0. Consequently, $price['price'] == $price[0].

For example, if the input was 0.00, then $price['price'] would return 0 which is considered empty according to the PHP manual.

I think you intend for the following (which works with 0.00 and 0.50):

$price = $_POST['price'];
$priceString = empty($price)?null:trim($price);