Generate Random Alphanumeric String with PHP

In this article, we will explain how to Generate Random Alphanumeric String with PHP. This is a simple function that allows you to generate random strings containing Letters and Numbers (alphanumeric) using PHP. The random strings can be used for various purposes, including:

Referral Code
Promotional Code
Coupon Code
OTP Code

Generate Random Alphanumeric String with PHP

Now you can see base on above PHP function we created a random_code() function to generate random alphanumeric string.

function random_code($limit)
{
	return substr(base_convert(sha1(uniqid(mt_rand())), 16, 36), 0, $limit);
}

echo random_code(8);

//Here's the output samples

mocpkwbn
460djcsn
j1m10z0t
4kj9cy68

The above script code relies on following PHP functions:

1. PHP base_convert() Function

The base_convert() function is used to convert a number from one base to another.

Example #1 base_convert() example
<?php
$hexa = 'D174';
echo base_convert($hexa, 18, 8);
?>
Output:
224756

2. PHP sha1() Function

The PHP sha1() function is used to calculate the sha1 hash of a string.

Example #1 sha1() Function
<?php
$str = "Random";
echo sha1($str);
?>
Output:
58d888c08aa561f370e38cee976121532a883d71

3. PHP uniqid() Function

The PHP uniqid function Generate a unique ID.

Example #1 uniqid() Function
<?php
echo uniqid();
?>
Output:
//Here's the uniqid() Function output samples

5b6af218a8eb6
5b6af22304783
5b6af22c4e386
5b6af23fb6bed

4. PHP mt_rand() Function

The PHP mt_rand() function generates a random integer using the Mersenne Twister algorithm.

Example #1 mt_rand() Function
<?php
echo mt_rand();
?>
Output:
//Here's the mt_rand() Function output samples

576535237
1894593969
1647369290
1903411751

Live Demo

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4 Comments
  1. İsmail Görkem Kara says

    Hello,

    Is there likely to repeat the output given by this code?

    1. Full Stack developer says

      yes right there is change repeat the output, for it you can store code in database and recheck it before store new code in database .

  2. Chelle says

    hi how about coding for random football team generator

  3. Chelle says

    hi how about coding for random football team generator

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