CODEWITHSUNDEEP
phprandom
AKor
AKor

Reputation: 8882

PHP excluding numbers from rand() function

I'm running rand() 3 times, and I want to exclude the first two results from the possibilities of the function. Like if it hit 1 and 5, I want the next rand() to exclude 1 and 5 from its range. How would I do this?

Upvotes: 3

Views: 5889

Answers (3)

Eric G
Eric G

Reputation: 4058

If you want to generate three unique random(ish) numbers, you could use:

$totalNumsNeeded = 3;
$randoms = array();
while (count($randoms) < $totalNumsNeeded) {
    $random = rand($min, $max);
    if (!in_array($random, $randoms)) {
        $randoms[] = $random;
    }
}

Upvotes: 1

david
david

Reputation: 736

$last[];

for ($i = 0; $i < 10; $i++) {
  $min = getLow($last);
  $max = getHigh($last);

  $myrand =  rand ( $min, $max )
  $last[i] = $myrand;
}

You will need to build the two functions to itterate through the $last array and return the variables you want it to return... or if you are only looking for the last two, you could initialize $min and $max outside of the loop and set them on each itteration. This will continually tighten your random range though.

Another solution may be 

$last;
While (true) {
  $myRand = rand();
  if ($myRand != $last) {
    $last = $myRand;
    break;
  }

}

Upvotes: 0

cypher
cypher

Reputation: 6992

How about:

do {   
    $rand_number = rand();

}while(in_array($rand_number, array(1,5));

Upvotes: 5

Related Questions