Solved

PHP code that randomize number or letters combination

Posted on 2010-08-24
5
292 Views
Last Modified: 2013-12-13
I need PHP randomize function or code for my newsletter confirmation page..
do you know one?
0
Comment
Question by:Braveheartli
5 Comments
 
LVL 34

Accepted Solution

by:
Beverley Portlock earned 300 total points
ID: 33510591
Try the attached. You can vary the size of the result string as well as the letters that appear in it
// 009 Generate a near unique, non-sequential code
     //
     // Parameters: $codeSize - The size of the code to generate. Longer is more secure
     //             $codeChars - The set of characters to use to generate the key
     //
     // Returns: A simple string
     //
     function nearUniqueCode( $codeSize = 10, $codeChars= "" ) {
          $code  = "";
          $chars = ($codeChars != "" ) ? $codeChars : "abcdefghjkmnopqrstuvwxyzABCDEFGHJKLMNPQRTUVWXYZ0123456789";
          $chLen = strlen( $chars );


          // Build the code
          //
          for ( $i=0; $i < $codeSize; $i++ ) {
               $pos =  mt_rand(0, $chLen-1);
               $code .= substr( $chars, $pos, 1 );
          }

          return $code;
     }

Open in new window

0
 
LVL 2

Assisted Solution

by:gilem
gilem earned 100 total points
ID: 33510595
Well simply, you can use http://us.php.net/manual/en/function.rand.php.

However, if you want something like a confirmation code that is hard to guess,
function genRandomString() {
    $length = 10;
    $characters = ’0123456789abcdefghijklmnopqrstuvwxyz’;
    $string = ”;    

    for ($p = 0; $p < $length; $p++) {
        $string .= $characters[mt_rand(0, strlen($characters)-1)];
    }

    return $string;
}

ref.
http://www.lost-in-code.com/programming/php-code/php-random-string-with-numbers-and-letters/
0
 
LVL 4

Assisted Solution

by:Fugas
Fugas earned 50 total points
ID: 33510760
I always use something like this
<?php 
$username="peter";
$mail="blah@blah.com";
echo md5(time().$username.$mail);
?>

Open in new window

0
 
LVL 2

Assisted Solution

by:Gatherer_Hade
Gatherer_Hade earned 50 total points
ID: 33510963
Use the uniqid() function.  It is gauranteed to be unique.  A random number may not be unique.

0
 
LVL 1

Author Closing Comment

by:Braveheartli
ID: 33511164
thank you
0

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Developers of all skill levels should learn to use current best practices when developing websites. However many developers, new and old, fall into the trap of using deprecated features because this is what so many tutorials and books tell them to u…
Things That Drive Us Nuts Have you noticed the use of the reCaptcha feature at EE and other web sites?  It wants you to read and retype something that looks like this.Insanity!  It's not EE's fault - that's just the way reCaptcha works.  But it is …
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
The viewer will learn how to create a basic form using some HTML5 and PHP for later processing. Set up your basic HTML file. Open your form tag and set the method and action attributes.: (CODE) Set up your first few inputs one for the name and …

830 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question