How would it be possible to generate a random, unique string using numbers and letters for use in a verify link? Like when you create an account on a website, and it sends you an email with a link, and you have to click that link in order to verify your account
How can I generate one of those using PHP?
Security Notice: This solution should not be used in situations where the quality of your randomness can affect the security of an application. In particular,
rand()anduniqid()are not cryptographically secure random number generators. See Scott's answer for a secure alternative.
If you do not need it to be absolutely unique over time:
md5(uniqid(rand(), true))
Otherwise (given you have already determined a unique login for your user):
md5(uniqid($your_user_login, true))
PHP 7 standard library provides the random_bytes($length) function that generate cryptographically secure pseudo-random bytes.
Example:
$bytes = random_bytes(20);
var_dump(bin2hex($bytes));
The above example will output something similar to:
string(40) "5fe69c95ed70a9869d9f9af7d8400a6673bb9ce9"
More info: http://php.net/manual/en/function.random-bytes.php
PHP 5 (outdated)
I was just looking into how to solve this same problem, but I also want my function to create a token that can be used for password retrieval as well. This means that I need to limit the ability of the token to be guessed. Because uniqid is based on the time, and according to php.net "the return value is little different from microtime()", uniqid does not meet the criteria. PHP recommends using openssl_random_pseudo_bytes() instead to generate cryptographically secure tokens.
A quick, short and to the point answer is:
bin2hex(openssl_random_pseudo_bytes($bytes))
which will generate a random string of alphanumeric characters of length = $bytes * 2. Unfortunately this only has an alphabet of [a-f][0-9], but it works.
function crypto_rand_secure($min, $max)
{
$range = $max - $min;
if ($range < 1) return $min; // not so random...
$log = ceil(log($range, 2));
$bytes = (int) ($log / 8) + 1; // length in bytes
$bits = (int) $log + 1; // length in bits
$filter = (int) (1 << $bits) - 1; // set all lower bits to 1
do {
$rnd = hexdec(bin2hex(openssl_random_pseudo_bytes($bytes)));
$rnd = $rnd & $filter; // discard irrelevant bits
} while ($rnd > $range);
return $min + $rnd;
}
function getToken($length)
{
$token = "";
$codeAlphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
$codeAlphabet.= "abcdefghijklmnopqrstuvwxyz";
$codeAlphabet.= "0123456789";
$max = strlen($codeAlphabet); // edited
for ($i=0; $i < $length; $i++) {
$token .= $codeAlphabet[crypto_rand_secure(0, $max-1)];
}
return $token;
}
crypto_rand_secure($min, $max) works as a drop in replacement for rand() or mt_rand. It uses openssl_random_pseudo_bytes to help create a random number between $min and $max.
getToken($length) creates an alphabet to use within the token and then creates a string of length $length.
Source: http://us1.php.net/manual/en/function.openssl-random-pseudo-bytes.php#104322
I've created an object-oriented solution based on Scott's answer:
<?php
namespace Utils;
/**
* Class RandomStringGenerator
* @package Utils
*
* Solution taken from here:
* http://stackoverflow.com/a/13733588/1056679
*/
class RandomStringGenerator
{
/** @var string */
protected $alphabet;
/** @var int */
protected $alphabetLength;
/**
* @param string $alphabet
*/
public function __construct($alphabet = '')
{
if ('' !== $alphabet) {
$this->setAlphabet($alphabet);
} else {
$this->setAlphabet(
implode(range('a', 'z'))
. implode(range('A', 'Z'))
. implode(range(0, 9))
);
}
}
/**
* @param string $alphabet
*/
public function setAlphabet($alphabet)
{
$this->alphabet = $alphabet;
$this->alphabetLength = strlen($alphabet);
}
/**
* @param int $length
* @return string
*/
public function generate($length)
{
$token = '';
for ($i = 0; $i < $length; $i++) {
$randomKey = $this->getRandomInteger(0, $this->alphabetLength);
$token .= $this->alphabet[$randomKey];
}
return $token;
}
/**
* @param int $min
* @param int $max
* @return int
*/
protected function getRandomInteger($min, $max)
{
$range = ($max - $min);
if ($range < 0) {
// Not so random...
return $min;
}
$log = log($range, 2);
// Length in bytes.
$bytes = (int) ($log / 8) + 1;
// Length in bits.
$bits = (int) $log + 1;
// Set all lower bits to 1.
$filter = (int) (1 << $bits) - 1;
do {
$rnd = hexdec(bin2hex(openssl_random_pseudo_bytes($bytes)));
// Discard irrelevant bits.
$rnd = $rnd & $filter;
} while ($rnd >= $range);
return ($min + $rnd);
}
}
<?php
use Utils\RandomStringGenerator;
// Create new instance of generator class.
$generator = new RandomStringGenerator;
// Set token length.
$tokenLength = 32;
// Call method to generate random string.
$token = $generator->generate($tokenLength);
You can use custom alphabet if required. Just pass a string with supported chars to the constructor or setter:
<?php
$customAlphabet = '0123456789ABCDEF';
// Set initial alphabet.
$generator = new RandomStringGenerator($customAlphabet);
// Change alphabet whenever needed.
$generator->setAlphabet($customAlphabet);
SRniGU2sRQb2K1ylXKnWwZr4HrtdRgrM
q1sRUjNq1K9rG905aneFzyD5IcqD4dlC
I0euIWffrURLKCCJZ5PQFcNUCto6cQfD
AKwPJMEM5ytgJyJyGqoD5FQwxv82YvMr
duoRF6gAawNOEQRICnOUNYmStWmOpEgS
sdHUkEn4565AJoTtkc8EqJ6cC4MLEHUx
eVywMdYXczuZmHaJ50nIVQjOidEVkVna
baJGt7cdLDbIxMctLsEBWgAw5BByP5V0
iqT0B2obq3oerbeXkDVLjZrrLheW4d8f
OUQYCny6tj2TYDlTuu1KsnUyaLkeObwa
I hope it will help someone. Cheers!
I'm late but I'm here with some good research data based on the functions provided by Scott's answer. So I set up a Digital Ocean droplet just for this 5-day long automated test and stored the generated unique strings in a MySQL database.
During this test period, I used 5 different lengths (5, 10, 15, 20, 50) and +/-0.5 million records were inserted for each length. During my test, only the length 5 generated +/-3K duplicates out of 0.5 million and the remaining lengths didn't generate any duplicates. So we can say that if we use a length of 15 or above with Scott's functions, then we can generate highly reliable unique strings. Here is the table showing my research data:
Update: I created a simple Heroku app using these functions that returns the token as a JSON response. The app can be accessed at https://uniquestrings.herokuapp.com/api/token?length=15
I hope this helps.
You can use UUID(Universally Unique Identifier), it can be used for any purpose, from user authentication string to payment transaction id.
A UUID is a 16-octet (128-bit) number. In its canonical form, a UUID is represented by 32 hexadecimal digits, displayed in five groups separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters (32 alphanumeric characters and four hyphens).
function generate_uuid() {
return sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ),
mt_rand( 0, 0xffff ),
mt_rand( 0, 0x0C2f ) | 0x4000,
mt_rand( 0, 0x3fff ) | 0x8000,
mt_rand( 0, 0x2Aff ), mt_rand( 0, 0xffD3 ), mt_rand( 0, 0xff4B )
);
}
//calling funtion
$transationID = generate_uuid();
some example outputs will be like:
E302D66D-87E3-4450-8CB6-17531895BF14
22D288BC-7289-442B-BEEA-286777D559F2
51B4DE29-3B71-4FD2-9E6C-071703E1FF31
3777C8C6-9FF5-4C78-AAA2-08A47F555E81
54B91C72-2CF4-4501-A6E9-02A60DCBAE4C
60F75C7C-1AE3-417B-82C8-14D456542CD7
8DE0168D-01D3-4502-9E59-10D665CEBCB2
hope it helps someone in future :)
This function will generate a random key using numbers and letters:
function random_string($length) {
$key = '';
$keys = array_merge(range(0, 9), range('a', 'z'));
for ($i = 0; $i < $length; $i++) {
$key .= $keys[array_rand($keys)];
}
return $key;
}
echo random_string(50);
Example output:
zsd16xzv3jsytnp87tk7ygv73k8zmr0ekh6ly7mxaeyeh46oe8
Use the code below to generate the random number of 11 characters or change the number as per your requirement.
$randomNum=substr(str_shuffle("0123456789abcdefghijklmnopqrstvwxyz"), 0, 11);
or we can use custom function to generate the random number
function randomNumber($length){
$numbers = range(0,9);
shuffle($numbers);
for($i = 0;$i < $length;$i++)
$digits .= $numbers[$i];
return $digits;
}
//generate random number
$randomNum=randomNumber(11);
e.g (in pseudo code)
int myInt = random(0, numcharacters)
char[] codealphabet = 'ABCDEF12345'
char random = codealphabet[i]
repeat until long enough
This is a simple function that allows you to generate random strings containing Letters and Numbers (alphanumeric). You can also limit the string length. These random strings can be used for various purposes, including: Referral Code, Promotional Code, Coupon Code. Function relies on following PHP functions: base_convert, sha1, uniqid, mt_rand
function random_code($length)
{
return substr(base_convert(sha1(uniqid(mt_rand())), 16, 36), 0, $length);
}
echo random_code(6);
/*sample output
* a7d9e8
* 3klo93
*/
When trying to generate a random password you are trying to :
First generate a cryptographically secure set of random bytes
Second is turning those random bytes into a printable string
Now, there are multiple way to generate random bytes in php like :
$length = 32;
//PHP 7+
$bytes= random_bytes($length);
//PHP < 7
$bytes= openssl_random_pseudo_bytes($length);
Then you want to turn these random bytes into a printable string :
You can use bin2hex :
$string = bin2hex($bytes);
or base64_encode :
$string = base64_encode($bytes);
However, note that you do not control the length of the string if you use base64. You can use bin2hex to do that, using 32 bytes will turn into a 64 char string. But it will only work like so in an EVEN string.
So basically you can just do :
$length = 32;
if(PHP_VERSION>=7){
$bytes= random_bytes($length);
}else{
$bytes= openssl_random_pseudo_bytes($length);
}
$string = bin2hex($bytes);
Here is ultimate unique id generator for you. made by me.
<?php
$d=date ("d");
$m=date ("m");
$y=date ("Y");
$t=time();
$dmt=$d+$m+$y+$t;
$ran= rand(0,10000000);
$dmtran= $dmt+$ran;
$un= uniqid();
$dmtun = $dmt.$un;
$mdun = md5($dmtran.$un);
$sort=substr($mdun, 16); // if you want sort length code.
echo $mdun;
?>
you can echo any 'var' for your id as you like. but $mdun is better, you can replace md5 to sha1 for better code but that will be very long which may you dont need.
Thank you.
function random_string($length = 8) {
$alphabets = range('A','Z');
$numbers = range('0','9');
$additional_characters = array('_','=');
$final_array = array_merge($alphabets,$numbers,$additional_characters);
while($length--) {
$key = array_rand($final_array);
$password .= $final_array[$key];
}
if (preg_match('/[A-Za-z0-9]/', $password))
{
return $password;
}else{
return random_string();
}
}
after reading previous examples I came up with this:
protected static $nonce_length = 32;
public static function getNonce()
{
$chars = array();
for ($i = 0; $i < 10; $i++)
$chars = array_merge($chars, range(0, 9), range('A', 'Z'));
shuffle($chars);
$start = mt_rand(0, count($chars) - self::$nonce_length);
return substr(join('', $chars), $start, self::$nonce_length);
}
I duplicate 10 times the array[0-9,A-Z] and shuffle the elements, after I get a random start point for substr() to be more 'creative' :) you can add [a-z] and other elements to array, duplicate more or less, be more creative than me
<?php
function generateRandomString($length = 11) {
$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$charactersLength = strlen($characters);
$randomString = '';
for ($i = 0; $i < $length; $i++) {
$randomString .= $characters[rand(0, $charactersLength - 1)];
}
return $randomString;
}
?>
above function will generate you a random string which is length of 11 characters.
I always use this my function to generate a custom random alphanumeric string... Hope this help.
<?php
function random_alphanumeric($length) {
$chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ12345689';
$my_string = '';
for ($i = 0; $i < $length; $i++) {
$pos = mt_rand(0, strlen($chars) -1);
$my_string .= substr($chars, $pos, 1);
}
return $my_string;
}
echo random_alphanumeric(50); // 50 characters
?>
It generates for example: Y1FypdjVbFCFK6Gh9FDJpe6dciwJEfV6MQGpJqAfuijaYSZ86g
If you want compare with another string to be sure that is a unique sequence you can use this trick...
$string_1 = random_alphanumeric(50);
$string_2 = random_alphanumeric(50);
while ($string_1 == $string_2) {
$string_1 = random_alphanumeric(50);
$string_2 = random_alphanumeric(50);
if ($string_1 != $string_2) {
break;
}
}
echo $string_1;
echo "<br>\n";
echo $string_2;
it generate two unique strings:
qsBDs4JOoVRfFxyLAOGECYIsWvpcpMzAO9pypwxsqPKeAmYLOi
Ti3kE1WfGgTNxQVXtbNNbhhvvapnaUfGMVJecHkUjHbuCb85pF
Hope this is what you are looking for...
A simple solution is to convert base 64 to alphanumeric by discarding the non-alphanumeric characters.
This one uses random_bytes() for a cryptographically secure result.
function random_alphanumeric(int $length): string
{
$result='';
do
{
//Base 64 produces 4 characters for each 3 bytes, so most times this will give enough bytes in a single pass
$bytes=random_bytes(($length+3-strlen($result))*2);
//Discard non-alhpanumeric characters
$result.=str_replace(['/','+','='],['','',''],base64_encode($bytes));
//Keep adding characters until the string is long enough
//Add a few extra because the last 2 or 3 characters of a base 64 string tend to be less diverse
}while(strlen($result)<$length+3);
return substr($result,0,$length);
}
Edit: I just revisited this because I need something a bit more flexible. Here is a solution that performs a bit better than the above and gives the option to specify any subset of the ASCII character set:
<?php
class RandomText
{
protected
$allowedChars,
//Maximum index to use
$allowedCount,
//Index values will be taken from a pool of this size
//It is a power of 2 to keep the distribution of values even
$distributionSize,
//This many characters will be generated for each output character
$ratio;
/**
* @param string $allowedChars characters to choose from
*/
public function __construct(string $allowedChars)
{
$this->allowedCount = strlen($allowedChars);
if($this->allowedCount < 1 || $this->allowedCount > 256) throw new \Exception('At least 1 and no more than 256 allowed character(s) must be specified.');
$this->allowedChars = $allowedChars;
//Find the power of 2 equal or greater than the number of allowed characters
$this->distributionSize = pow(2,ceil(log($this->allowedCount, 2)));
//Generating random bytes is the expensive part of this algorithm
//In most cases some will be wasted so it is helpful to produce some extras, but not too many
//On average, this is how many characters needed to produce 1 character in the allowed set
//50% of the time, more characters will be needed. My tests have shown this to perform well.
$this->ratio = $this->distributionSize / $this->allowedCount;
}
/**
* @param int $length string length of required result
* @return string random text
*/
public function get(int $length) : string
{
if($length < 1) throw new \Exception('$length must be >= 1.');
$result = '';
//Keep track of result length to prevent having to compute strlen()
$l = 0;
$indices = null;
$i = null;
do
{
//Bytes will be used to index the character set. Convert to integers.
$indices = unpack('C*', random_bytes(ceil(($length - $l) * $this->ratio)));
foreach($indices as $i)
{
//Reduce to the smallest range that gives an even distribution
$i %= $this->distributionSize;
//If the index is within the range of characters, add one char to the string
if($i < $this->allowedCount)
{
$l++;
$result .= $this->allowedChars[$i];
}
if($l >= $length) break;
}
}while($l < $length);
return $result;
}
}
Scott, yes you are very write and good solution! Thanks.
I am also required to generate unique API token for my each user. Following is my approach, i used user information (Userid and Username):
public function generateUniqueToken($userid, $username){
$rand = mt_rand(100,999);
$md5 = md5($userid.'!(&^ 532567_465 ///'.$username);
$md53 = substr($md5,0,3);
$md5_remaining = substr($md5,3);
$md5 = $md53. $rand. $userid. $md5_remaining;
return $md5;
}
Please have a look and let me know if any improvement i can do. Thanks
Here is what I'm using on one of my projects, it's working great and it generates a UNIQUE RANDOM TOKEN:
$timestampz=time();
function generateRandomString($length = 60) {
$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$charactersLength = strlen($characters);
$randomString = '';
for ($i = 0; $i < $length; $i++) {
$randomString .= $characters[rand(0, $charactersLength - 1)];
}
return $randomString;
}
$tokenparta = generateRandomString();
$token = $timestampz*3 . $tokenparta;
echo $token;
Please note that I multiplied the timestamp by three to create a confusion for whoever user might be wondering how this token is generated ;)
I hope it helps :)
Here is a fun one
public function randomStr($length = 16) {
$string = '';
while (($len = strlen($string)) < $length) {
$size = $length - $len;
$bytes = random_bytes($size);
$string .= substr(str_replace(['/', '+', '='], '', base64_encode($bytes)), 0, $size);
}
return $string;
}
Stolen from laravel here
I believe the problem with all the existing ideas is that they are probably unique, but not definitely unique (as pointed out in Dariusz Walczak's reply to loletech). I have a solution that actually is unique. It requires that your script have some sort of memory. For me this is a SQL database. You could also simply write to a file somewhere. There are two implementations:
First method: have TWO fields rather than 1 that provide uniqueness. The first field is an ID number that is not random but is unique (The first ID is 1, the second 2...). If you are using SQL, just define the ID field with the AUTO_INCREMENT property. The second field is not unique but is random. This can be generated with any of the other techniques people have already mentioned. Scott's idea was good, but md5 is convenient and probably good enough for most purposes:
$random_token = md5($_SERVER['HTTP_USER_AGENT'] . time());
Second method: Basically the same idea, but initially pick a maximum number of strings that will ever be generated. This could just be a really big number like a trillion. Then do the same thing, generate an ID, but zero pad it so that all IDs are the same number of digits. Then just concatenate the ID with the random string. It will be random enough for most purposes, but the ID section will ensure that it is also unique.
Simplifying Scotts code above by removing unnecessary loops which is slowing down badly and does not make it any more secure than calling openssl_random_pseudo_bytes just once
function crypto_rand_secure($min, $max)
{
$range = $max - $min;
if ($range < 1) return $min; // not so random...
$log = ceil(log($range, 2));
$bytes = (int) ($log / 8) + 1; // length in bytes
$rnd = hexdec(bin2hex(openssl_random_pseudo_bytes($bytes)));
return $min + $rnd%$range;
}
function getToken($length)
{
return bin2hex(openssl_random_pseudo_bytes($length)
}
Scottas the correct answer. Scott is using OpenSSL's cryptographically secure psudo-random number generator (CSPRNG) which will choose the most secure source of entropy based on your platform. – rookuniqidare insecure. Use something likeRandom::alphanumericString($length)orRandom::alphanumericHumanString($length). – caw