Generate a VERY large random number

[Mgccl]

I have to generate a very large random number between $min and $max

This number is larger than the largest number PHP can handle, so I have to output it as a string

I want to know how to make one.

I have seen one of them that works only in *nix.

 

[Balmung-San]

How many digits are you looking for here?

 

Since PHP can't handle the size of the number I would suggest just doing a for loop to get the number of digits you want, then randomizing each digit, and adding it onto the string.

[ted_chou12]

function generate_password($length= {
$password = "";
$possible = "0123456789";
$i = 0;
while ( $i < $length ) {
$char = substr($possible, mt_rand(0, strlen($possible)-1), 1);
$password .= $char;
$i++;
}
return $password;
}
$password = generate_password($length=;//8 can be optimzed to the no. of digits you want.

As long as php can run, i guess however many digits you wish, it can be generated, but processing it such as division or multiplication, im not sure.

btw. basically used the random pass. just limited the string to numeric.

Ted

[Mgccl]

Thx guys.

Here is the script I have made, kinda fast

function bcrand($min, $max){//input STRING!
$top = bcsub($max,$min);
$rand = bcadd($top, 1);
$length = strlen($top);
while(bccomp($rand,$top)==1){
	unset($rand_part);
	$n = 0;
	while(9*$n <= $length){
		if($length - 9*$n >= 9){
			$rand_part[] = rand(0,999999999);
		}else{
			$j = 0; $foo = '';
			while($j < $length-9*$n){
				$foo .= '9';
				++$j;
			}
			$foo += 0;
			$rand_part[] = rand(0,$foo);
		}
		++$n;
	}
	$i = 0;
	$rand ='';
	$count = count($rand_part);
	while($i < $count){
		$rand .= $rand_part[$i];
		++$i;
	}
}
return bcadd($rand,$min);
}