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3920 - Challenge for a photographer
I set myself a challenge this afternoon ... to get some good current photos of the dogs out in the field. It was a beautiful afternoon, and even in our flat lands the landscapes are spectacular. Now Billy can run - great circles, and fast. And trying to catch a 35 m.p.h. greyhound on a camer ....

3919 - What is a web framework?
When you write web applications, there are many features you'll need which mirror features other people have needed too. Now - there's nothing to stop you writing your own code (maybe in Ruby, Python or Perl) including these features ... but wouldn't it be better to use the feature set that someone ....

3918 - Multiple page web applications - maintaining state - PHP
As you want to do more in an online application, you need to link a series of forms together. There's a limit to how much you can expect your users to enter on one page, and almost inevitably they'll want feedback as they go through a series of steps. So multiple forms is natural, with each encour ....

3917 - BODMAS - the order a computer evaluates arithmetic expressions
What order does a computer program use to evaluate expressions? If I write   2 + 3 * 4 + 5 does it start off, left to right ...   2 + 3 is 5   5 * 4 is 20   20 + 5 is 25 No! it does not, even though the newcomer might think that was the most natural way for ....

3916 - PHP variables - dynamically typed. What does that mean?
When we're programming, we store data in our computer memory in one step of our process, then read it back for further reference or processing in a later step. In the very early days, this was planned out using the numeric location in the computer memory, but very rapidly programming langu ....

3915 - How does PHP work?
From Learning to Program in PHP and PHP Programming - presented this week, and repeating at regular intervals - see schedule. Let's say that I want a web page - with a single URL (Uniform Resource Locator / name) - to show up differently in my browser depending on how I run it ... • I write th ....

3914 - While, for, foreach or something else to loop.
Newcomers to programming often ask "which loop should I use?" Every language has a while loop, most have a for loop (though sometimes those differ in what they do - Python is an exceptional one, for example), and many have a foreach loop. Then you get the odd ones such as the until loop in Perl . ....

3913 - How many times ... has this loco headed west through Tenby? - Python exceptions
If you have a stock of 117 locomotives on your railway, and each is on the front of a train through Tenby as it heads for Pembroke just 12 times a year (it's a Summer Saturday Special working!), will - in the course of their 30 year life - every locomotive have worked that train? Will the reason tha ....

3912 - Sand to Arabia, Coals to Newcastle or Woodburners to Russia
As I'm filtering out unwanted emails, something occasionally catches my eye and I wonder ...  Hello, My name is Elena and I live in small city in Russia. I have small daughter but husband left us a few years ago. Due to deep crisis recently I losted job and can not pay the heating bills for ....

3911 - How well do you know Perl and / or Python?
Test your Perl knowledge A simple little quiz that you may enjoy ... ten questions [here]. Questions good for any recent version of Perl 5 - say 5.10 and upwards, as the quiz tests your knowledge of some of the fundamentals. The quiz was, of course, written for a purpose - to answer the questio ....

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