Archive for the ‘Programming Techniques’ Category

Fake function/method overloading in PHP

Sunday, June 26th, 2011

Ever needed to call the same function with different number of parameters? Easy right, just use default values:

  1. function tryMe($param1, $param2 = NULL, $param3 = NULL) {}

But what if you want to make the first parameter optional?
Here’s a simple technique for doing so it in a transparent way.
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Shuffling associative array

Tuesday, April 19th, 2011

We have shuffle() to reorder a numeric array, we have array_rand() to randomly pick a specific number of values from an array but there’s no built-in command for shuffling an associative array. After having seen a few pretty bad solutions I decided to offer my own.

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MySQL comparison catch: ‘abc’ = 00

Monday, May 25th, 2009

I was shocked to find a weakness in my authentication library today. It was possible to get around the password check if you knew the username. All you had to do was to enter 00 as the password. Or you just entered 00 as the username too and you got authenticated as the first user.
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Dealing with different configuration for development and production box

Friday, December 12th, 2008

All right, this isn’t exactly a rocket science, it’s just something I use and find very handy.

We all develop (and test) on one computer and deploy to a different computer to make the changes live. Having to run the application in two different environments brings a challenge of using different configuration based on where the application runs.
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Calculating time difference in months as a decimal number

Wednesday, October 8th, 2008

There’s a number of functions out there for calculating the length of time in months but they only provide integer results. MySQL can do it too, for instance. But what if you need to get a precise number?

2008-11-15 minus 2008-10-01 can’t be one if you’re calculating rent. It must be 1.466…

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