Remove useless zero digits from decimals in PHP

$num + 0 does the trick.

echo 125.00 + 0; // 125
echo '125.00' + 0; // 125
echo 966.70 + 0; // 966.7

Internally, this is equivalent to casting to float with (float)$num or floatval($num) but I find it simpler.

This is what I use:

function TrimTrailingZeroes($nbr) {
    return strpos($nbr,'.')!==false ? rtrim(rtrim($nbr,'0'),'.') : $nbr;
}

N.B. This assumes . is the decimal separator. It has the advantage that it will work on arbitrarily large (or small) numbers since there is no float cast. It also won't turn numbers into scientific notation (e.g. 1.0E-17).

you could just use the floatval function

echo floatval('125.00');
// 125

echo floatval('966.70');
// 966.7

echo floatval('844.011');
// 844.011