Tag Archives: PHP


I hope everyone using WordPress know that it ships with a backup plugin. It’s a great beginner solution that makes people aware that they should care about making backups of their data. But to me it didn’t make the cut a while ago when I really started to care about safe backup of my data. […]

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Verhoeff’s Dihedral Group D5 Check

I just finished implementing the Verhoeff checksum algorithm in PHP, you can download it as verhoeff.zip. Yes, mathematically it’s a bit more elaborate than other checksum algorithms, but with look-up tables it’s fairly simple and lightweight. The implementation provides two functions calcsum($number) and checksum($number). The first one return a check digit for the decimal number […]

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