Generate An Authentication Code

Snippet Code

This basic snippet will create a random authentication code, or just a random string.


<?php

# This particular code will generate a random string

# that is 25 charicters long 25 comes from the number

# that is in the for loop

$string = "abcdefghijklmnopqrstuvwxyz0123456789";

for($i=0;$i<25;$i++){

    $pos = rand(0,36);

    $str .= $string{$pos};

}

echo $str;

# If you have a database you can save the string in 

# there, and send the user an email with the code in

# it they then can click a link or copy the code

# and you can then verify that that is the correct email

# or verify what ever you want to verify

?>

Snippet Comments

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IT companies in Toronto
2011-06-22 19:50:32

The code works very well. I have used it at work with great success. The programmers did such a great job with it.

orlando personal injury attorneys
2011-06-21 19:23:37

The code is so good on this. There is so much that you can do on it.

Supra For Sale
2011-06-13 23:40:24

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attorney
2011-02-08 02:59:01

Thanks that code is really useful for me.

develophp
2010-11-24 11:36:37

Forgot to add this to my previous reply...

@php_scripts You should read here http://php.net/manual/en/function.rand.php

develophp
2010-11-24 11:34:36

I think you guys are mixing up the hash char lengths

MD5 = 32 chars
SHA1 = 40 chars

My current activation key generator is this
$key = md5(uniqid(time(), TRUE));

php scripts
2010-09-14 00:29:43

rand() in not a real random function i think. you can use MD5 or SHA1 hash to generate An Authentication Code.

Sam Yong
2009-07-25 00:00:00

I agree with Wilson. you can just simply use an md5 to generate a random string. $rand_string = substr(md5(time() . mt_rand()),0,40);

Wilson
2009-02-03 00:00:00

It might be just as easy to create a string like this that could be inserted into a db:
$id = md5(uniqid(rand(), 1)); (40 characters)

This would be more secure if using it for a forgotten password email and being compared to in a database.

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