Generate An Authentication Code - Snippet

Generate An Authentication Code

Online Now: 1

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Snippets Functions Classes

Home | PHP Resources | MySQL Zipbase | Forums

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

Add Your Comment

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.

Add Your Comment

Snippet Tools

Rate this Snippet:

Request Snippet Update

Suggested Difficulty Level: Novice
Current Score: 2.7
Total votes: 266
Total Views: 4246

Other top snippets by admin:

1. JPG to ASCII Converter
2. Add (th, st, nd, rd, th) to the end of a number
3. Dynamic Page Content From Links
4. AJAX Quickie
5. Simple Image CAPTCHA

Search

User Panel

Register And Post Your Own Snippets

Snippets On Watch

1. Auth Class with (2.83 of 87)

2. Test Please Delete (2.83 of 30)

3. Return all repeated (3.64 of 72)

4. Convert an integer (3.3 of 71)

5. URL Shortening for (2.75 of 52)

6. Monthly Content Sorting (3 of 45)

7. Show String Trimmed (2.97 of 65)

8. Human readable file (2.01 of 70)

9. Randomize array values (2.8 of 82)

10. Create a recursive (3.35 of 55)

New Snippets

1. Parse RFC822 date (4 of 1)

2. Dynamic Image Uploading (5 of 1)

3. Spam Filter (0 of 0)

4. Is Multiple (0 of 0)

5. Base64 Encode / (0 of 0)

6. URL Encode / (0 of 0)

7. temp openbills (0 of 0)

8. Php Iban Validator (0 of 0)

9. Mysql Table Builder (0 of 0)

10. File size of (1.75 of 4)

11. Mail from your (1 of 1)

12. OddEven Class (0 of 0)

13. Detect if a (1 of 1)

14. MB CopyMCF-DIR :: (5 of 1)

15. Upper/Lower Case Accented (0 of 0)

16. Zodiac Signs (3 of 1)

17. Really useful code (2.5 of 2)

18. Calculate Central European (0 of 0)

19. Email Attachment (4 of 1)

20. ImageMagick Image Upload (0 of 0)

21. convert plain html (2 of 2)

22. Tag Builder (3.25 of 4)

23. Get Inserted ID (4.33 of 3)

24. Watermark An Image (3.33 of 3)

25. Check Prime Numbers (1.5 of 8)

PHPSnips.com - ©2010