PHP函数round_pad_zero：小数位四舍五入并补零

function round_pad_zero($num, $precision){ if ($precision < 1) { return round($num, 0); } $r_num = round($num, $precision); $num_arr = explode('.', "$r_num"); if (count($num_arr) == 1) { return "$r_num" . '.' . str_repeat('0', $precision); } $point_str = "$num_arr[1]"; if (strlen($point_str) < $precision) { $point_str = str_pad($point_str, $precision, '0'); } return $num_arr[0] . '.' . $point_str;}//示例echo round_pad_zero(3223342.506, 4);