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406 - Assignment, equality and identity in PHP
In PHP, you'll find that there's an = operator (that's one = sign), an == operator (that's two equals signs) and an === operator (triple equals). The single = sign is an assignment - it tells PHP to work out the expression to the right of the = sign and save it to the variable / location named on ....

405 - Horse's Mouth is a year old
I've been writing "The Horse's Mouth" for a year! When I started, I wondered if I would find enough to say but I've had rather the reverse as an issue - which 20% to say and which 80% to leave out; occasionally, I've been tempted to post twice in a day but I think that could be too much. It's a ....

404 - How to check that a string contains a number in Tcl
In Tcl, all variables hold strings. If you perform an arithmetic operation such as an expr, an incr or a numeric comparision, the incoming strings are converted into a numbers internally, the calculations are done, and the results are converted back to strings and saved. It might not sound very eff ....

403 - Full circle - made it back to an old haunt
(Dateline - Wednesday, 3rd August 2005) Some 30 years ago, I worked for Tektronix, selling and supporting their range of very high resolution graphics terminals. My territory was the South West of England - "Swindon to Penzance" was how I described it - and my most major customers were the aerospa ....

402 - Netless
Seen a gap in "The Horse's Mouth" for the last couple of days? For the first time in quite a while, I've been offline ... running an onsite course during the day, staying at a hotel without network connectivity and where even my backup mobile phone is out of range overnight. Contract customers a ....

401 - What is an SQL injection attack?
It's where an unauthorised user enters illegal data that gets placed into an SQL command, with the purpose of changing the meaning of that SQL command. For example, you might use the SQL query    SELECT count(id) FROM user where uname = "xxxxxx" and pword = "yyyyy" to validate a use ....

400 - New in the shops
I promised you a report on what's new in the techie and books stores in the USA. In the past, we've found that the USA has been somewhat ahead of the UK and that's been exciting and positive. But it seems that times are a-changing. On this trip, the shelves in the bookstores are sadder than I hav ....

399 - simplicity hides real size
How big is the star? One of the "trick"s behind a large, successful web site will be that you won't realise just how big it is - it looks simple and elegant and you leave happy, having found the information that you need / having seen enough (there's a difference there between an informational and ....

398 - Training course material - why we write our own
If you come on a Well House Consultants Python course, you'll be taught by the guy who actually wrote the course, and who wrote and developed the Python course material. The same comments apply for a Perl or a PHP or a Linux or a MySQL or a Tcl course. But developing a course and material is an ex ....

397 - Where now for dial-up providers?
We're in a fast moving business, and times change; last year's success company may have based its success on a transient market place that's overtaken by events and it'll have to come up with a new niche and adapt and adopt or die. It does have a strong hand in doing this with its existing customer ....

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