Question

I am working currently with PHP validation of decimal values. The function works well in determining decimals/integers from letters but my goal is to format the decimal/integer values into proper currency values such as $0.00.

How can I format the input value into currency format with the dollar sign such as $0.00?

EXAMPLE

<?
if (isset($_POST['price'])){
    $price = $_POST['price'];
    $priceString = empty($price['price'])?null:trim($price['price']);
            if(!empty($priceString)) { 
         if  (preg_match('/^[+\-]?\d+(\.\d+)?$/', $price)){
             echo ('<div id="price_input"><span id="resultval">'.$price.'</span></div>');
                }
             else {
             echo ('<div id="price_input"><span id="resultval">Please input a valid decimal number.</span></div>');
                  }
    }
    else {
        echo '';
         }              
}
?>

Answer 1

Use the money_format function:

money_format('$%i', 5.2);

outputs: $5.2

EDIT:

if  (preg_match('/^[+\-]?\d+(\.\d+)?$/', $price)){
    echo ('<div id="price_input"><span id="resultval">'
          .money_format('$%i', $price);
          .'</span></div>');
}