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3102 - AND and OR operators - what is the difference between logical and bitwise varieties?
Many modern programming languages have two operators for "or" and two for "and" - described as "bitwise" and "logical" operators. And you need to choose the right one in the right circumstances ... otherwise your code won't behave quite as you expect. Bitwise OR takes the internal bit pattern of t ....

3101 - The week before Christmas
The canal at Devizes earlier today as we passed through. You'll see from the ice that we weren't passing through by boat, nor was anyone else From the Perl for larger projects training course - a diagram to illustrate the problem of "diamond relationships". This is where a module "a" loads a mod ....

3100 - Looking ahead and behind in Regular Expressions - double matching
Look-ahead and look-behind are a way of "double matching" in a regular expression. If you're at a certain point in the match and you think "the next bit should conform to xxx and at the same time it should conform to yyy" then you can describe xxx via a look-ahead, and follow that with matching yyy ....

3099 - Perl - database access - DBD, DBI and DBIx modules
Perl's DBI module provides an excellent link from SQL databases to Perl, and the assorted DBD modules that fit underneath it allow it to operate well for a whole lot of different databases. But they are only excellent as far as they go - for the SQL statements have to be generated in your applicati ....

3098 - Learning Object Orientation in Perl through bananas and perhaps Moose
Perl has the most incredbible range of OO facilities (though at times it's overfeatured and a bit old fashioned / tricky to use). So yesterday I wrote a whole series of examples ... and then went on to explore Moose - a module which adds extra keywords and lets you define your classes in a shorter ....

3097 - Making Perl class definitions more conventional and shorter
Perl 5's object oriented capabilities are excellent - but often a little longwinded, and quite easy to get wrong. Moose sells itself as "postmodern object system for Perl 5 that takes the tedium out of writing object-oriented Perl"; it's available for download from the CPAN under same license as P ....

3096 - Contrast in pictures
I need to learn a bit more about some of the special settings on my camera ... and to re-train myself to think "settings" as I take pictures; at present, I just snap away with either the regular setup, or "available light" which gives me nighttime pictures that would have been regarded as mir ....

3095 - The Christmas Season has arrived
Remember that song - "It's beginning to look a lot like Christmas". Well - in many ways it feels like it's already the Christmas holiday. There's snow on the ground, traffic is quieter, and it's bitterly cold. Phones are quieter (that's largely because we've changed our phone company and our numbe ....

3094 - Setting your user_agent in PHP - telling back servers who you are
If your web page pulls information in from other sites, you'll be turning your web server into a client (browser) to those other sites - and just as your web server can identify the type of browser it's answering via the $_SERVER[HTTP_USER_AGENT] variable, so can the remote server. The default user ....

3093 - How many toilet rolls - hotel inventory and useage
Running Well House Manor, we buy a lot of hotel supplies - ranging from sheets and towels when they are to be replaced, through guest soaps and toilet rolls, salt, sugar and jams which are ordered from time to time, to weekly or twice weekly orders such as fruit and fresh products and ultimately the ....

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This page is from the web site of Well House Consultants who provide Open Source computer training. Program written / developed as a demonstration during a PHP course. The example is in module H113

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This is http://www.wellho.net/demo/mqclim.php
See source code here • More examples - same topic here
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