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Even early on, separate out your program from your HTML!

Even in the simplest of PHP applications, it's worthwhile to separate the validation of the incoming data from the calculations, and both of those elements from the HTML of the page itself. That means that you can use the calculation stuff - the "business logic" in other applications that use the same data, even offline ones. And it means you can change the look and feel later - or share it with your other pages / applications - easily.

Even on the first days of our PHP courses, I start to separate out the code from the view - calculating values that are to be shown on the page, storing them in variables, and the using them to fill in the view with a minimum of code. At first, the code and the view are all held in the same file (a PHP comment line of "=========" characters shows the separation), but quite quickly I'll demonstrate require and include and talk about siblings require_once and include_once.

Even though the examples that I write during a course such as the PHP Programming course I've been running this week are short, I'll ensure that the examples show a good technique for future expansion into applications of typical length.

Even though I could probably get better end-of-course reviews by sanitizing my examples, limiting what I talk about to the code in question, I choose not to do so. For I really want my delegates to leave with a knowledge and forward look which leaves them well placed to use the knowledge gained a day, a week, a month and a year after the course. Training if for the long term - and our training sets you up well for that long term.




Example inspired by a program [here] and the view it uses [here]. Run the program [here].

I have - carefully - avoided using buzzwords / buzzterms in the above, as they're not helpful to the newcomer in his / her first example. But any resemblance to Model / View / Controller is completely intentional!

(written 2013-04-25, updated 2013-05-04)

 
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)
  [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)
  [1182] Painting a masterpiece in PHP - (2007-05-10)
  [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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Passing variable between PHP pages - hidden fields, cookies and sessions
Some other Articles
Learning about Object Orientation in PHP - a new set of examples
Splitting the difference with PHP
Setting up strings in PHP
Passing variable between PHP pages - hidden fields, cookies and sessions
Even early on, separate out your program from your HTML!
Arrays in PHP - contain different and even mixed data types
The woman, the television, the bullock and Darlington
MVC and Frameworks - a lesson from first principles in PHP
Handling requests to a forum - the background process
Apache httpd - a robust, open source web server
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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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