A few days ago I was working on a project where it was crucial that all the item prices ended up with a 9 after a discount coupon was redeemed, in need for an quick way to round any given number to the closest nine I did a couple of searches on Google and on the PHP Manual and I found the following formula:
round($number / $nearest) * $nearest;
Seemed pretty much straightforward the only problem is… It didn’t worked as I wanted it to! Imagine that $number is 212 and $nearest is 9 for example, the expected result for this scenario should be 209, since 212 is closer to 209 than to 219. However simple arithmetic tell us that:
round(212 / 9) * 9 = 24 * 9 = 216
Continue reading ‘Round to the Nearest - Digit or Multiple?’
Today I’m going to share a minimalistic MySQL wrapper you can use to kick start you application database development. This class is made by just seven essential methods that fit in only 101 lines of code.
Continue reading ‘Lightweight MySQL Database Wrapper’
Yesterday I got my hands on my very first Lincoln (five dollars) bill, they seem much more older and used than Euro banknotes. As I had already made a Euro note serial number validation algorithm in PHP I thought: “why don’t I do the same for dollar bills?”.
Continue reading ‘My first five Dollar Bill’
Since the begining of this year the standart ISBN has now 13 numbers instead of 10 so, I did some functions for validating the ISBN-10 and EAN (works for ISBN-13) with PHP, maybe it’s useful for someone.
Continue reading ‘ISBN-10 and ISBN-13 (EAN) validation with PHP’
Have you ever come across a fake Euro banknote? Well, most of us probably have (at least those of us who live in the European Union, like me) - more than 300 thousand Euro banknotes are falsified every year.
Continue reading ‘Euro banknote validation with PHP’
I’ve developed a simple OCR CAPTCHA decoder in PHP, it’s pretty fast and breaks with a 100% success rate all CAPTCHAs that meet some requirements.
Continue reading ‘PHP CAPTCHA Decoder’
Today I’ll be sharing an algorithm that I use quite a lot, for generating passwords that are easily memorable and spelled - one may also call this type of passwords mnemonic passwords.
Continue reading ‘PHP Friendly Password Generator’
I’ve just finished my PHP Math Library and Abstraction Layer, I’ve been up all night in order to code it, but it was worth it. I am proud of it.
My PHP Math Library features the following:
Continue reading ‘PHP Math Library’
) here in Portugal, and we have been receiving some selling offers - of course we haven’t accepted any of them.
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