Function that you can use to extract the ID from YouTube links that
look like this:

http://www.youtube.com/watch?v=Fv2aS8YtpmU
http://www.youtube.com/vi/Fv2aS8YtpmU
http://www.youtube.com/?v=Fv2aS8YtpmU

and you can extract this "Fv2aS8YtpmU" so you can use it to get thumbnails that look like : http://img.youtube.com/vi/[videoid]/default.jpg

This module is used to generate the unique number and self check the numbers in social security, band accounts and etc.

Here you can find detailed explanation:
http://www.eclectica.ca/howto/modulus-11-self-check.php?start=1&count=5&generate=Generate#calculator

I have made this scirpt generate numbers in drop down list and write brojevi.txt file that you can download with numbers you have generated...

AJAX based submit form and use PHP to get results...

Very easy to use and understand, hope you will find it useful and easily edit it to fit your needs.

Very useful function that you can use to debug/show your array and it's contents.

Sometimes when you have problems with arrays and print_r() isn't very nice way to show array values because it shows everything in one line and then it is very hard to debug... this way I think it's much much easier.

Very simple script that you can use to find duplicated rows in SQL or you can use it to count same rows eg. Top 10 posters script or something like that... very usefull