PHP upgrade - traps to watch

For 2023 (and 2024 ...) - we are now fully retired from IT training.
We have made many, many friends over 25 years of teaching about Python, Tcl, Perl, PHP, Lua, Java, C and C++ - and MySQL, Linux and Solaris/SunOS too. Our training notes are now very much out of date, but due to upward compatability most of our examples remain operational and even relevant ad you are welcome to make us if them "as seen" and at your own risk.

Lisa and I (Graham) now live in what was our training centre in Melksham - happy to meet with former delegates here - but do check ahead before coming round. We are far from inactive - rather, enjoying the times that we are retired but still healthy enough in mind and body to be active!

I am also active in many other area and still look after a lot of web sites - you can find an index ((here))

Did you want a Perl or Python course that starts on a Sunday? Or to book an old course that starts way back on 31st December 1969?

Our new online booking system's been under test on our in-house server for a while, but it was this weekend it went live together with most of the rest of the site. Yes, we've tested code and tested it again, but there are always things (such as IP address recognition) that can only be emulated in testing and I expected (and still expect) a few funnies.

Tips / traps to watch ... "there, but for the grace of God, go I" you may say:

1. Don't have a variable in your $_SESSION array that's got the same name as a local variable. Configuration issue ... worked fine in house and caused problems at the ISP! Solution once I identified the problem, was as easy as renaming a local variable

2. If your server is in a different timezone to your test machine ... beware. That's what happened with all those course that, for a few minutes, were offered to start a day earlier. You see ... when it's 07:00 this morning in the UK, it's 11 p.m. last night in California!

Remember also ... all the standard PHP traps about register_globals, conflicting session names with other applications, and magic quotes. Yes, didn't fall for those ... just the slightly more obscure traps listed above.

(written 2005-10-31, updated 2006-06-05)

Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles

H114 - Sourcing, installing and configuring PHP
  [192] Current MySQL and PHP paths and upgrades - (2005-01-28)
  [316] Development Environments - (2005-05-19)
  [934] Clustering, load balancing, mod_rewrite and mod_proxy - (2006-11-21)
  [1667] Checking server performance for PHP generated pages - (2008-06-06)
  [1688] cannot restore segment prot after reloc message - PHP / httpd - (2008-06-26)
  [1731] Apache httpd, MySQL, PHP - installation procedure - (2008-08-01)
  [1768] What is built in to this httpd and PHP? - (2008-08-23)
  [1936] Quick Summary - PHP installation - (2008-12-12)
  [2317] How to make a Risotto (PHP build style) - (2009-08-02)
  [2433] Controlling, supressing, enabling PHP error messages - (2009-10-02)
  [2589] Your PHP code does not work? Here is where to start looking. - (2010-01-18)
  [2646] Compile but do not run PHP - syntax check only - (2010-02-22)
  [3132] Virtual Hosting with Apache http server - an overall scheme, and avoiding common pitfalls - (2011-01-14)
  [3635] Parse error: parse error, unexpected T_STRING on brand new web site - why? - (2012-03-03)
  [3955] Building up from a small PHP setup to an enterprise one - (2012-12-16)
  [4319] PHP - some quick fixes if scripts have issues, and how to use our support - (2014-11-19)
  [4437] Adding a PHP build option, rotating an image based on camera data, and a new look at thumbnails in PHP - (2015-02-22)

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Some other Articles

North, Norther and Northest - PHP 5 Objects
Setting the file name for a downloaded document
Double Dollars in PHP
Different ways of selling
PHP upgrade - traps to watch
New look to website
New servlet from old
Watch what you wear
Class, static and unbound variables
May I be politically incorrect?

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This is a page archived from The Horse's Mouth at http://www.wellho.net/horse/ - the diary and writings of Graham Ellis. Every attempt was made to provide current information at the time the page was written, but things do move forward in our business - new software releases, price changes, new techniques. Please check back via our main site for current courses, prices, versions, etc - any mention of a price in "The Horse's Mouth" cannot be taken as an offer to supply at that price.

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