PHP check if variable is a whole number

Question

I have this PHP code:

$entityElementCount = (-($highScore-$totalKeywordCount))/0.29;

What i want to know is, how to check whether $

Answer 1

function isInteger($value)
{
    // '1' + 0 == int, '1.2' + 0 == float, '1e2' == float
    return is_numeric($value) && is_int($value + 0);
}

function isWholeNumber($value)
{
    return is_numeric($value)
        && (is_int($value + 0)
            || (intval($value + 0) === intval(ceil($value + 0))));
}

If you want to check for both whole and decimal numbers, you can do the following:

if (isInteger($foo))
{
    // integer as int or string
}
if (isWholeNumber($foo))
{
    // integer as int or string, or float/double with zero decimal part
}
else if (is_numeric($foo))
{
    // decimal number - still numeric, but not int
}

This will correctly check your number without rounding it, casting it to int (which in the case of a decimal number will lose the decimal part), or doing any math. If, however, you want to treat 1.00 as a whole number, then that's a whole another story.