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Painting a masterpiece in PHP

In PHP, you can write a program that looks like a Rembrandt, or one that makes the dog's dinner look tidy. It's not only the mechanism of the language you need to learn to do a good job, but how to apply it.

This week, on my public PHP course, I have a group which is very IT professional in background, and very much concerned with writing good code efficiently, with easy maintainabiliy, enhancability, and element re-use across projects. So rather that use my mores standard "here is a program to ...", I've been writing new examples with a different twist as I go.

It's easy enough to code a box on a form to echo back what was on the previous form. But remember the user may enter all sorts of special characters that you need to deal with. And remember you need to do this multiple times. And remember that you need to be able to re-present the same form if the fields aren't correctly filled. And remember you would like to reuse near-identical logic on the next page. You're looking for nicely structured code - the Rembrandt not the dinner!
• Make good use of functions.
• Have common error handling logic.
• Put everything that varies into a single specification.
• Save the common code into an include file.
• Use good error messages.


I've put the example I finished with last night up on line - the source code is here and you can run it here. There ARE things still to be done ... - the error messages are common at the moment, and it's all in one file rather than using an include (a good way to do it for initial testing, after all!)
(written 2007-05-10, updated 2007-05-11)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
H115 - Designing PHP-Based Solutions: Best Practice
  [4691] Real life PHP application using our course training MVC example - (2016-06-05)
  [4641] Using an MVC structure - even without a formal framework - (2016-02-07)
  [4326] Learning to program - comments, documentation and test code - (2014-11-22)
  [4118] We not only teach PHP and Python - we teach good PHP and Python Practice! - (2013-06-18)
  [4069] Even early on, separate out your program from your HTML! - (2013-04-25)
  [3926] Filtering PHP form inputs - three ways, but which should you use? - (2012-11-18)
  [3820] PHP sessions - a best practice teaching example - (2012-07-27)
  [3813] Injection Attacks - PHP, SQL, HTML, Javascript - and how to neutralise them - (2012-07-22)
  [3539] Separating program and artwork in PHP - easier maintainance, and better for the user - (2011-12-05)
  [2679] How to build a test harness into your PHP - (2010-03-16)
  [2430] Not just a PHP program - a good web application - (2009-09-29)
  [2221] Adding a newsfeed for your users to a multipage PHP application - (2009-06-06)
  [2199] Improving the structure of your early PHP programs - (2009-05-25)
  [1794] Refactoring - a PHP demo becomes a production page - (2008-09-12)
  [1694] Defensive coding techniques in PHP? - (2008-07-02)
  [1623] PHP Techniques - a workshop - (2008-04-26)
  [1533] Short and sweet and sticky - PHP form input - (2008-02-06)
  [1490] Software to record day to day events and keep an action list - (2007-12-31)
  [1487] Efficient PHP applications - framework and example - (2007-12-28)
  [1482] A story about benchmarking PHP - (2007-12-23)
  [1391] Ordnance Survey Grid Reference to Latitude / Longitude - (2007-10-14)
  [1390] Converting from postal address to latitude / longitude - (2007-10-13)
  [1389] Controlling and labelling Google maps via PHP - (2007-10-13)
  [1381] Using a MySQL database to control mod_rewrite via PHP - (2007-10-06)
  [1323] Easy handling of errors in PHP - (2007-08-27)
  [1321] Resetting session based tests in PHP - (2007-08-26)
  [1194] Drawing hands on a clock face - PHP - (2007-05-19)
  [1181] Good Programming practise - where to initialise variables - (2007-05-09)
  [1166] Back button - ensuring order are not submitted twice (PHP) - (2007-04-28)
  [1052] Learning to write secure, maintainable PHP - (2007-01-25)
  [1047] Maintainable code - some positive advice - (2007-01-21)
  [945] Code quality counts - (2006-11-26)
  [936] Global, Superglobal, Session variables - scope and persistance in PHP - (2006-11-21)
  [896] PHP - good coding practise and sticky radio buttons - (2006-10-17)
  [839] Reporting on the 10 largest files or 10 top scores - (2006-08-20)
  [572] Giving the researcher power over database analysis - (2006-01-22)
  [563] Merging pictures using PHP and GD - (2006-01-13)
  [426] Robust checking of data entered by users - (2005-08-27)
  [394] A year on - should we offer certified PHP courses - (2005-07-28)
  [340] Code and code maintainance efficiency - (2005-06-08)
  [261] Putting a form online - (2005-03-29)
  [237] Crossfertilisation, PHP to Python - (2005-03-06)
  [123] Short underground journeys and a PHP book - (2004-11-19)


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Painting a masterpiece in PHP
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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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