PHP Random Number - php

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

<?php
function genRandomString() {
$length = 10; // set length of string
$characters = '0123456789'; // for undefined string
$string ="";
for ($p = 0; $p < $length; $p++) {
$string .= $characters[mt_rand(0, strlen($characters))];
}
return $string;
}
$s = genRandomString(); //this is your random print var
or
function rand_string( $length )
{
$chars = "0123456789";
$size = strlen( $chars );
for( $i = 0; $i < $length; $i++ )
{
$str .= $chars[ rand( 0, $size – 1 ) ];
}
return $str;
}
$rid= rand_string( 6 ); // 6 means length of generate string
?>

Answer 4

$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.

Answer 5

The least amount of code I saw for something like this was:
function random_num($n=5)
{
return rand(0, pow(10, $n));
}
But I'm assuming it requires more processing to do this than these other methods.