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This basically randomly pick a number between the min and max values. This is made because the rand() and mt_rand() function can not accept numbers larger than 2^31 or 2^63, depend on your processor and complier.
Here is how it works:
1. Subtract the minimal value from the maximal value
2. Generate the numbers for the digits by using rand()
3. Combine the digits
4. Check if it is too large or not, if is, redo 2, if not,go on.
5. Add the minimal value to the random value.
In worst case, by chance, 10 random number need to be generated before we get a good one. Numbers like 100000, 10000.
In best case, only one will be generated, numbers like 99999, 9999
| <?php
function bcrand($min, $max){
bcscale(0);
if(bccomp($max,$min)!=1){
return 0;
}
$top = bcsub($max,$min);
$rand = bcadd($top, 1);
$length = strlen($top);
$n = 0;
while(9*$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];
++$i;
}
while(bccomp($rand,$top)==1){
$rand = substr($rand,1,strlen($rand)).rand(0,9);
}
return bcadd($rand,$min);
}
?> | |
Here is an example of useage:
| <?php
//Note, the arguments are strings
//that represent numbers, not numbers
bcrand('0','9999999999999');
?> | |
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