bigint_dec2num( $dec)
bigint_num2dec( $num)
bigint_str2num( $str)
bigint_num2str( $num)
bigint_random( $n, $s)
bigint_powmod( $x, $y, $m)
bigint_pow( $b, $e)
bcpowmod( $x, $y, $modulus, $scale)
bigint_mul( $a, $b)
bigint_div( $a, $b, $is_mod)
bigint_zerofill( $str, $num)
