Is this file the same as that file? The files may or may not be binary. We could compare the modify dates, or the sizes. But, those are not very accurate to know if a file has really changed.

Introducing MD5 Checksum. We can feed the files into Digest::MD5 in binary mode.

This is a great way to do Incremental Backups.

This is also an easy way to verify checksums when downloading files from the internet which list their MD5 Checksums.

You'll need the Digest::MD5 Perl Module.

Need to GZip a file using Perl?

Use Compress::Zlib.

This is a simple perl script which creates a GZip file.

Change the case of an array.

This snippet originally is used for targetting ads banners depended on the geographic location of the visitor, but can be used for other purposes. Also originally is used for US and the rest of the world, but you can add check for other countries too.

Example of how to use CURL with PHP.

A simple search array example.

Format a phone number with php.

I needed to send an email through an authenticated SMTP server. I found the snippet on the PHP website to do the trick.

Convert an irregular name=value pair string into a formatted array.

Generate a random number or string in PHP.