[php] php random x digit number

I need to create a random number with x amount of digits.

So lets say x is 5, I need a number to be eg. 35562 If x is 3, then it would throw back something like; 463

Could someone show me how this is done?

This question is related to php random numbers

The answer is


function random_numbers($digits) {
    $min = pow(10, $digits - 1);
    $max = pow(10, $digits) - 1;
    return mt_rand($min, $max);
}

Tested here.


Please not that rand() does not generate a cryptographically secure value according to the docs:

http://php.net/manual/en/function.rand.php

This function does not generate cryptographically secure values, and should not be used for cryptographic purposes. If you need a cryptographically secure value, consider using random_int(), random_bytes(), or openssl_random_pseudo_bytes() instead.

Instead it is better to use random_int(), available on PHP 7 (See: http://php.net/manual/en/function.random-int.php).

So to extend @Marcus's answer, you should use:

function generateSecureRandomNumber($digits): int {
   return random_int(pow(10, $digits - 1), pow(10, $digits) - 1);
}

function generateSecureRandomNumberWithPadding($digits): string {
   $randomNumber = random_int(0, pow(10, $digits) - 1);
   return str_pad($randomNumber, $digits, '0', STR_PAD_LEFT);
}

Note that using rand() is fine if you don't need a secure random number.


You can use rand($min, $max) for that exact purpose.

In order to limit the values to values with x digits you can use the following:

$x = 3; // Amount of digits
$min = pow(10,$x);
$max = pow(10,$x+1)-1);
$value = rand($min, $max);

function random_number($size = 5)
{
    $random_number='';
    $count=0;
    while ($count < $size ) 
        {
            $random_digit = mt_rand(0, 9);
            $random_number .= $random_digit;
            $count++;
        }
    return $random_number;  
}

you people really likes to complicate things :)

the real problem is that the OP wants to, probably, add that to the end of some really big number. if not, there is no need I can think of for that to be required. as left zeros in any number is just, well, left zeroes.

so, just append the larger portion of that number as a math sum, not string.

e.g.

$x = "102384129" . complex_3_digit_random_string();

simply becomes

$x = 102384129000 + rand(0, 999);

done.


this simple script will do

$x = 4;//want number of digits for the random number
$sum = 0;


for($i=0;$i<$x;$i++)
{
    $sum = $sum + rand(0,9)*pow(10,$i);

}

echo $sum;

rand(1000, 9999); works more faster than x4 times rand(0,9);

benchmark:

rand(1000, 9999)      : 0.147 sec.
rand(0,9)x4 times     : 0.547 sec.

both functions was running in 100000 iterations to make results more explicit


you can generate any x-digit random number with mt_rand() function. mt_rand() much faster with rand() function syntax : mt_rand() or mt_rand($min , $max).

read more

example : <?php echo mt_rand(); ?>


do it with a loop:

function randomWithLength($length){

    $number = '';
    for ($i = 0; $i < $length; $i++){
        $number .= rand(0,9);
    }

    return (int)$number;

}

I usually just use RAND() http://php.net/manual/en/function.rand.php

e.g.

rand ( 10000 , 99999 );

for your 5 digit random number


Treat your number as a list of digits and just append a random digit each time:

function n_digit_random($digits) {
  $temp = "";

  for ($i = 0; $i < $digits; $i++) {
    $temp .= rand(0, 9);
  }

  return (int)$temp;
}

Or a purely numerical solution:

function n_digit_random($digits)
  return rand(pow(10, $digits - 1) - 1, pow(10, $digits) - 1);
}

Following is simple method to generate specific length verification code. Length can be specified, by default, it generates 4 digit code.

function get_sms_token($length = 4) {

    return rand(
        ((int) str_pad(1, $length, 0, STR_PAD_RIGHT)),
        ((int) str_pad(9, $length, 9, STR_PAD_RIGHT))
    );
}

echo get_sms_token(6);

This is another simple solution to generate random number of N digits:

$number_of_digits = 10;
echo substr(number_format(time() * mt_rand(),0,'',''),0,$number_of_digits);

Check it here: http://codepad.org/pyVvNiof


The following code generates a 4 digits random number:

echo sprintf( "%04d", rand(0,9999));

Here is a simple solution without any loops or any hassle which will allow you to create random string with characters, numbers or even with special symbols.

$randomNum = substr(str_shuffle("0123456789"), 0, $x);

where $x can be number of digits

Eg. substr(str_shuffle("0123456789"), 0, 5);

Results after a couple of executions

98450
79324
23017
04317
26479

You can use the same code to generate random string also, like this

$randomNum=substr(str_shuffle("0123456789abcdefghijklmnopqrstvwxyzABCDEFGHIJKLMNOPQRSTVWXYZ"), 0, $x);

Results with $x = 11

FgHmqpTR3Ox
O9BsNgcPJDb
1v8Aw5b6H7f
haH40dmAxZf
0EpvHL5lTKr

rand or mt_rand will do...

usage:

rand(min, max);

mt_rand(min, max);

function rand_number_available($already_mem_array,$boundary_min,$boundary_max,$digits_num)
{

    $already_mem_array_dim = count($already_mem_array);         // dimension of array, that contain occupied elements

    // --- creating Boundaries and possible Errors
    if( empty($digits_num) ){   
            $boundary_dim = $boundary_max - $boundary_min;
            if($boundary_dim <= 0){
                $error = -1;                                    // Error that might happen. Difference between $boundary_max and $boundary_min must be positive
            }else{
                $error = -2;                                    // Error that might happen. All numbers between, $boundary_min and $boundary_max , are occupied, by $already_mem_array
            }                                   
    }else{
            if($digits_num < 0){                                // Error. If exist, $digits_num must be, 1,2,3 or higher
                $error = -3; 
            }elseif($digits_num == 1){                          // if 'one-figure' number
                $error = -4;                                    // Error that might happen. All 'one-figure' numbers    are occupied, by $already_mem_array
                $boundary_min = 0;
                $boundary_max = 9;
                $boundary_dim = $boundary_max-$boundary_min;
            }elseif($digits_num == 2){                          // if 'two-figure' number
                $error = -5;                                    // Error that might happen. All 'two-figure' numbers    are occupied, by $already_mem_array
                $boundary_min = 10;
                $boundary_max = 99;
                $boundary_dim = $boundary_max-$boundary_min;
            }elseif($digits_num>2){                             // if 'X-figure' number. X>2
                $error = -6;                                    // Error that might happen. All 'X-figure' numbers  are occupied, by $already_mem_array. Unlikely to happen
                $boundary_min = pow(10, $digits_num-1);         // stepenovanje - graduation
                $boundary_max = pow(10, $digits_num)-1;
                $boundary_dim = $boundary_max-$boundary_min;
            }

    }
    // -------------------------------------------------------------------


    // --- creating response ---------------------------------------------
    if( ($already_mem_array_dim <= $boundary_dim)   &&  $boundary_dim>0 ){              // go here only if, there are AVAILABLE numbers to extract, and [difference] $boundary_dim , is positive
        do{
            $num = rand($boundary_min,$boundary_max);
        }while( in_array($num, $already_mem_array) );
        $result = $num;
    }else{
        $result = $error;                                       // Limit that happened  
    }

    return $result;
    // -------------------------------------------------------------------

}

the simplest way i can think of is using rand function with str_pad

<?php
echo str_pad(rand(0,999), 5, "0", STR_PAD_LEFT);
?>

In above example , it will generate random number in range 0 to 999.

And having 5 digits.


Well you can use as simple php function mt_rand(2000,9000) which can generate a 4 digit random number

mt_rand(2000,9000) 

This function works perfectly with no repeats and desired number of digits.

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

You can call the function and pass the number of digits for example:

randomDigits(4);

sample results:

4957 8710 6730 6082 2987 2041 6721

Original script got from this gist


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