PHP Random Number

Question

I want to generate a random number in PHP where the digits itself should not repeat in that number. Is that possible? Can you paste sample code here? Ex: 674930, 145289. [i.e Same digit shouldn't come] Thanks

Answer 1

Here is a good way of doing it:

$amountOfDigits = 6;
$numbers = range(0,9);
shuffle($numbers);

for($i = 0;$i < $amountOfDigits;$i++)
   $digits .= $numbers[$i];

echo $digits; //prints 217356

If you wanted it in a neat function you could create something like this:

function randomDigits($length){
    $numbers = range(0,9);
    shuffle($numbers);
    for($i = 0;$i < $length;$i++)
       $digits .= $numbers[$i];
    return $digits;
}

Answer 2

function randomize($len = false)
{
   $ints = array();
   $len = $len ? $len : rand(2,9);
   if($len > 9)
   {
      trigger_error('Maximum length should not exceed 9');
      return 0;
   }
   while(true)
   {
      $current = rand(0,9);
      if(!in_array($current,$ints))
      {
         $ints[] = $current;
      }
      if(count($ints) == $len)
      {
          return implode($ints);
      }
   }
}
echo randomize(); //Numbers that are all unique with a random length.
echo randomize(7); //Numbers that are all unique with a length of 7

Something along those lines should do it

Answer 3

$result= "";
$numbers= "0123456789";
$length = 8;

$i = 0; 

while ($i < $length) 
{ 
    $char = substr($numbers, mt_rand(0, strlen($numbers)-1), 1);
    //prevents duplicates
    if (!strstr($result, $char)) 
    { 
        $result .= $char;
        $i++;
    }
}

This should do the trick. In $numbers you can put any char you want, for example: I have used this to generate random passwords, productcodes etc.