PHP - How Compare Decimal Values

I'm trying figure out how to compare decimal values in PHP properly.

$get_decimal_value = mysqli_query($conn, "SELECT DecimalValue FROM my_table WHERE Id = $some_id LIMIT 1")
or die($db_conn_err);

if(mysqli_num_rows($get_decimal_value) == 1 )
{
    $row = mysqli_开发者_开发百科fetch_array($get_decimal_value);
    $my_decimal = $row['DecimalValue'];

    if($my_decimal > 0)
    {
         // IS THIS CORRECT???
         // Does it need to be like '0.00' ?
         // it seems to work both ways...
    }
}

Thank you!

PHP is weakly typed, so e.g. 1.0 > 0 should hold no surprises (even things like 1 + "2" work as expected).

It is correct. PHP can transform 0 to float without any problems.