The extended or derived class has all variables and functions of the base class (this is called ‘inheritance’ despite the fact that nobody died)
From the PHP official documentation
Problem: When a day is not a normal day
Monday morning. I’ve just arrived at the office, and I see my first task to do: fix a bug in a calendar from one of our websites. Actually there are 2 calendars, and one calculation to show the difference in days between the two dates. Somebody discovered a weird behaviour when you select a range of days in the end of March… the difference of days is not an integer number, but a float one!
I isolated the problem, shortening the range of days, until I discovered that the problem is in the last weekend of March. From Friday 23rd to Monday 26th of March, there are 2.95 days (instead of just 3 days). What’s happening that weekend? Why is the last weekend of March somehow weird? Any idea?
If you want to know the solution, see the first comment of this post. Tip: I use a PHP function to convert the dates into integer timestamps (seconds), I substract these integers, and finally I divide by 3600*24, to know the difference in days.
Sometimes “random” is the best choice
…as nature does. Create something from random numbers.
Here are a couple of examples, from a Sunday morning programming session (plus 1 extra hour from the daylight savings change):
– Random bubbles
– Random trees
Each time you reload the page, a new drawing appears.
To see them correctly, you need Firefox or Opera, because the images are SVG (Scalable Vector Graphics).
Have fun!
Philosophical thought of the week
A morning office conversation:
Tony (a workmate): Is there a PHP function to stop for a moment the execution of a page?
Me: Yes, it is “sleep()”.
Tony: Just what I need, to sleep a little bit. Does it work with microseconds?
Me: No, it works with seconds. For example, if you write sleep(1), it is going to stop for 1 second.
Tony: Ok, thanks, you are a crack.
Me: And, even more, if you write sleep(2), it’ll stop for 2 seconds.
Tony: Why don’t we use it with a negative value? Probably we will speed up our websites!