Not all code are created equal. Some pieces of code are more important than others. The code that powers critical parts of a nuclear power plant is hopefully of a much higher standard than the code behind this site, but how do you recognize which quality of code you should aim for when developing websites? [...]
Posts Tagged Programming
Quality of code
Jan 14
How do you know good code?
Dec 28
One of the great challenges of PHP is that it’s so easy to learn, that just about anyone can learn it with not too much of an effort. While this is great for the number of PHP developers, it also seems to have the effect, that there is a huge number of bad examples of [...]
With Perl you can do many interesting transformations of IP-numbers. Below is two small examples allowing conversions from “IP quad” (xxx.xxx.xxx.xxx) format to a single decimal and back. The decimal format may be more convenient and efficient to store in a database. sub ip2dec ($) { return unpack N => pack CCCC => split /\./ [...]
Suppose you’ve just filled you digital camera with an endless stream of photos. You want to place them online at your website, but placing 5+ megapixel files online, well…probably a bad idea. Let’s resize them to a propper size – and why not use Perl and ImageMagick for the job. Not a problem, here’s a [...]
Changing files from one format to another is quite easy with a little bit of ImageMagick . In the example below a JPG image (test.jpg) is converted into a GIF-image (test.gif). To output in a different (ImageMagick supported ) format, just change the “image->Set” line. [php] no_tags #!/usr/bin/perl -w use strict; use Image::Magick; my $image [...]
Image sizes in Perl
Sep 24
If you need for figure out the size of an image, fetch Image::Size from CPAN , it’s just what you need. The module recognizes the most common image-formats such as JPG, GIF, PNG, PSD, TIFF and plenty more. The interface is simple and will get you what you need with no trouble at all. [php] [...]
Image sizes and PHP
Sep 23
If you have the GD extension available, you can do a few useful things. One of the simple things is getting an image size is a simple matter. You can either fetch the height and width in seperate variables – or even fetch the height and width in a string pre-formatted for use in an [...]
Reading Exif data with PHP
Sep 22
Within most photos from digital cameras besides the actual image, there’s a little ”information block” call EXIF data. If you have the correct PHP extension installed on your server – the one called ”exif” – it’s pretty easy to read the EXIF data and display them, as you like. First, let’s check if the extension [...]
Simple benchmarks in PHP
Sep 21
If you’re doing some basic profiling of your PHP scripts, the build-in microtime function can help you make some simple benchmarking fast. Here’s a rough example to show you how it could be used. The doSomething function is the function we want to benchmark. 1 2 3 4 5 6 7 8 9 10 11 [...]
Some websites require access control, and sometimes you may need to generate a password for a user. Here’s a simple function that can do just that. The $base-variable contains the characters allowed in the password. The supplied string may be changed, but the selected charaters should exist on all keyboards (as far as I know). [...]