Problem generating random

new_to_php2004

Okay, I have this problem. I need to generate a random number "$seed" to be between 1 and "$seed". All of these numbers need to be unique and should not repeat a previously generated number.

Example. The seed is 3, the first number generated is 3, the second number generated is 1 and then the generator generates 3 again for the third number, but it then generates a fourth
number 2 because 3 had previously been generated.

Any assistance would be appreciated. I think that I am very close.

Basically, I want to generated all of the consecutive numbers between 1 and "seed" without putting them in a row.

<?php

echo"<html><head><title>SAMPLE</title></head><body>";
$seed=3; 
$temp=array($seed);

function random_gen($seed)  {                                                      # RANDOM NUMBER FUNCTION
  srand((double)microtime()*1000000);                                               #SETS UPPER / LOWER BOUNDS
  $random=rand(1,$seed);                                                           #GENERATES RANDOM NUMBER
#  echo"DEBUG IM GENERATING THE FOLLOWING RANDOM NUMBER: $random <br><br>";
  return $random;
}

echo"  There are $seed unique numbers to be generated in a random number<br>";


for ($j=0; $j<$seed; $j++)  {
    $random=random_gen($seed);
    $temp[$j]=$random;  

  if($random==$temp)  {
    $random=random_gen($seed);
    $temp=$random;  

  }

  echo"Random number is $random<br><br>";

}

echo"</body></html>";

?>

nunomira

hi,

maybe this?

<?php

$seed = 3; 
$temp = array (); // create an empty array

function random_gen ($seed)
{
  global $temp; // use the $temp array
  $random = rand (1, $seed); //generate $random
  if (!in_array ($random, $temp)) // if $random doesn't already exist in the array $temp 
  {
  	$temp [count ($temp)] = $random; // add $random to the array
  }
  else // if it exists already in the array
  {
  	return random_gen ($seed); // generate a new random number
  }
}
// call the function $seed number of times to obtain $seed elements in the array

for ($i = 1; $i <= $seed; $i++)
{
	random_gen ($seed);
}

// check what's in the array
print_r ($temp);

?>

Note: As of PHP 4.2.0, there is no need to seed the random number generator with srand() or mt_srand() as this is now done automatically.