One of the great beauties of cookies (and derived from that, of PHP sessions) is that they can be used across a series of pages on the same server - indeed we use cookies on this site to record our visitor's preferences for colour, font size, country and open source langauge(s) via our user preference page, and we then use those inputs to apply to all pages and styles on the site.

We're a simple session demonstration showing this in a module from our new PHP Techniques Workshop that we ran for the first time last week - the source code of the first page is here and the source of a second page is here.

Run the first page here and each time you do so you'll step through a limeric. Run the other page hereto report on the status of the first page from a different URL.

Practical uses of this? Anything from two applications which need to share data but are maintained by different teams to applications with multiple top level pages - and even captcha technology, where the session is used to link the graphics to the page. More about that latter here and try in here

(written 2008-05-18 21:42:02)

 H303 - PHP - Long and short term cookies and security

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Exchange Rates - PHP with your prices in your users currency
Using cookies and sessions to connect different URLs - PHP
Seeing how others do it - PHP training
Using a utility method to construct objects of different types - Python
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Tektronix 4010 series / Python Tuples
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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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