generating random codes


Posted on 16th Feb 2014 07:03 pm by admin

Hi guys n gals,

I have a requirement to generate 250,000 unique codes...

These codes are for a tracking service and will be stored in the database (table field has a unique index).

Now I am working on the assumption this must work on the command line as the script will take a long time to complete... here is the salient pat of my code...

Code: <?php
...
function appendToCode( &$val , $key , $append )
{
$val = $val . $append;
}

$chars = "ABCDEFGHJKLMNPQRSTUVWXYZ";
$charend = strlen ( $chars );

$date = date ( 'md' );

$month = $date[0].$date[1];
$year = $date[2].$date[3];

$datecode = $chars[$month] . $chars[$year[0]] . $chars[$year[1]];
$codes = array();
$no_codes = isset( $_GET['no_codes'] ) ? $_GET['no_codes'] : 250000;
$codecount = 0;

do
{
for ( $j = $codecount ; $j < $no_codes ; $j++ )
{
$trackcode = NULL;
for ( $i = 0 ; $i < 7 ; $i++ )
{
$trackcode .= $chars[rand( 0 , $charend - 1 )];
echo ( time() - $start ) . PHP_EOL;
}
$codes[] = $trackcode . $date;

}
//$t = count($codes);
//echo 'Codes Generated: ' . $t . PHP_EOL;
//echo 'Last Code: ' . $codes[--$t] . PHP_EOL;

$codes = array_unique( $codes );
$codecount = count ( $codes );

//echo 'Unique Codes: ' . $codecount . PHP_EOL;
// the following statement prevents infinite loop in dev mode...
if (
(time() - $start) > 150
)
{
break;
}


} while ( $codecount < ($no_codes) - 1 );
...
The last characters of the code relate to the date - as these codes will only be developed every now and then - not a frequent occurrence and will allow a check on the database to see if codes ending in that 3 character string exist...

What I am asking is, is there a more efficient method of performing this operation.

Any tips would be most welcome.

No comments posted yet

Your Answer:

Login to answer
179 Like 8 Dislike
Previous forums Next forums
Other forums

IDOC error
Hi, When i send IDOC from ECC system to MII there is no problem ECC side, i says message sent succe

Strange HTML Tag?
I recently noticed some odd HTML appear in some of the websites I host. Not all of them are run on a

Problem in OnClientClick and OnClick sync
Hi,Strange and irritating problem: I have below button declaration in markup of the aspx page:

use an array from 1 class in a second class
I have a class that adds data to an array

Then I have a second class and I need to check if t

updating a single value to multiple non consecutive rows
I need to update the same value to multiple non consecutive rows. I need to add an experation date t

Any help with my email script?
I have an email script, I have not tested it, although someone tested it for me and said it worked f

array empty
Hiya peeps,

Ok here is the codes.

order.php

Code:

Hardcopy printing is to wide
I want to make a hardcopy at runtime of my active form like this

Warning: mysql_num_rows() expects parameter 1
When i add quote at the end of this link
example:http://localhost/articlemania/category.php?cid=3

Random date selection
i want to select random date with time(hour+minutes+sec) where date is specified(10/22/2009) and tim

Sign up to write
Sign up now if you have flare of writing..
Login   |   Register
Follow Us
Indyaspeak @ Facebook Indyaspeak @ Twitter Indyaspeak @ Pinterest RSS



Play Free Quiz and Win Cash