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For 2021 - online Python 3 training - see ((here)).

Our plans were to retire in summer 2020 and see the world, but Coronavirus has lead us into a lot of lockdown programming in Python 3 and PHP 7.
We can now offer tailored online training - small groups, real tutors - works really well for groups of 4 to 14 delegates. Anywhere in the world; course language English.

Please ask about private 'maintenance' training for Python 2, Tcl, Perl, PHP, Lua, etc.
Redirecting to your main domain for correct security keys

Do you want to come to Well House Manor as a base to see Wiltshire or for a course? If it's you're first visit you'll want to find us on a map - and we have a map at http://www.wellho.net/demo/gmap.php which you can zoome to five levels at the click of a button and do other smart things with. And that map is Google powered.

But not everyone arrives at that page via www.wellho.net; you'll find that it's mirrored on www.wellho.co.uk, for example, and a handful of other domains. And occasionally we find people arriving by IP address. And if they did, they got not a map but an error message about the Google key being wrong.

Rather than register and maintain a series of keys, I have modified the map page to redirect visitors to the www.wellho.net site if they've arrived from elsewhere, by checking which server they've called up within my PHP and sending out a short redirect page if they're on a subsidiary domain. The extra code is as follows:


if ($_SERVER[SERVER_NAME] != "www.wellho.net") {
 
print <<<DONE
<html>
<head>
<meta http-equiv="refresh" content="6;url=http://www.wellho.net/demo/gmap.php">
</head>
<body>
This demonstration relies on a Google key on our main server (www.wellho.net)
but you are visiting from a different domain. You will be redirected shortly
(if you are not, please follow
<a href=http://www.wellho.net/demo/gmap.php>this link)</a>.
</body>
</html>
DONE;
 
exit(0);
}



Literally, that's saying "if you are not on the main server, please move on to that server after showing this page for 6 seconds". This is known as client pull - it relies on the browser to request the new page - so it's good practise to provide an onwards link too, just in case the browser can't / won't do as it has been directed.

Try out this, and the map - here are links to the page that redirects, and to the working page. If you're interested in the map iteself and how we generate that, you can see our source code here, and we'll teach you how to write code like this on our PHP techiques Workshop and Intermediate PHP training weekend.




Index under "This web site needs a different Google Maps API key. A new key can be generated at http://code.google.com/apis/maps."
(written 2010-03-13)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
W502 - Web and Intranet - HTML Document Anatomy
  [857] Strikingly busy - (2006-09-06)
  [993] Positioning with Cascading Style Sheets - (2006-12-16)
  [1160] HTML - example of a simple web page - (2007-04-24)
  [1187] Updating a page strictly every minute (PHP, Perl) - (2007-05-14)
  [1431] Getting the community on line - some basics - (2007-11-13)
  [1463] All the special characters in HTML ... - (2007-12-07)
  [1811] Alternative URLs using % symbol encoding - (2008-09-27)
  [2246] What difference does using the XHTML standard really make? - (2009-06-18)
  [3517] Tags used in writing this blog - (2011-11-12)
  [3563] How big is a web page these days? Does the size of your pages matter? - (2011-12-26)
  [4034] The VERY basics of a web page ... and web site - (2013-03-09)

H309 - PHP - Maps, Graphics and Geographics
  [320] Ordnance Survey - using a 'Get a map' - (2005-05-22)
  [563] Merging pictures using PHP and GD - (2006-01-13)
  [665] PHP Image viewing application - (2006-04-01)
  [937] Display an image from a MySQL database in a web page via PHP - (2006-11-22)
  [1104] Drawing dynamic graphs in PHP - (2007-03-09)
  [1194] Drawing hands on a clock face - PHP - (2007-05-19)
  [1389] Controlling and labelling Google maps via PHP - (2007-10-13)
  [1390] Converting from postal address to latitude / longitude - (2007-10-13)
  [1391] Ordnance Survey Grid Reference to Latitude / Longitude - (2007-10-14)
  [1628] Gant charts - drawing them with a PHP script - (2008-05-03)
  [1724] addslashes v mysql_real_escape_string in PHP - (2008-07-27)
  [1734] All around the world? - (2008-08-03)
  [1752] Dynamic maps / geographics in PHP - (2008-08-13)
  [1756] Ever had One of THOSE mornings? - (2008-08-16)
  [1923] Making it all worthwhile - (2008-12-04)
  [1956] Images for Christmas - (2008-12-21)
  [2343] World Flags in your PHP pages - (2009-08-10)
  [2361] Geocoding - converting address to latitude / Longitude with PHP via Google - (2009-08-14)
  [2390] Dynamic / changing images on your web page - (2009-09-01)
  [2583] Reducing image size on digital photos - PHP - (2010-01-17)
  [2729] Uploading a document or image to its own URL via a browser - (2010-04-18)
  [2939] Protecting your images from use out of context - (2010-08-29)
  [3027] Server logs - drawing a graph of gathered data - (2010-11-03)
  [3133] An image from a website that occasionally comes out as hyroglyphics - (2011-01-14)
  [3197] Finding and diverting image requests from rogue domains - (2011-03-08)
  [3211] Computer Graphics in PHP - World (incoming data) to Pixel (screen) conversion - (2011-03-24)
  [3447] Needle in a haystack - finding the web server overload - (2011-09-18)
  [3536] UK Mapping Data - and more to come - under government Open Data measures - (2011-12-03)
  [3584] QR codes - graphics images that provide quick phone links - (2012-01-18)
  [3734] QR codes with marketing logos embedded - (2012-05-16)
  [3817] Fpdf - generating .pdf documents easily from your PHP program - (2012-07-24)
  [4178] Where are you? How to write a geosensitive application - (2013-09-18)
  [4365] The changing face of Christmas - (2014-12-26)
  [4437] Adding a PHP build option, rotating an image based on camera data, and a new look at thumbnails in PHP - (2015-02-22)
  [4655] Image indexer / thumbnail display scripts in PHP - (2016-02-25)


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Changing Times
Some other Articles
How to build a test harness into your PHP
Reaching out to the community - a good case for support
Blowing out the winter cobwebs
Changing Times
Redirecting to your main domain for correct security keys
Make and makefiles - a commented example to help you learn
Multiple Inheritance in C++ - a complete example
Dear Planners, please provide viable alternatives
Melksham - Carnival, Party in the Park, and Spot the Oddity
Pointers to Pointers to Pointers - what is the point?
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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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