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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.
New Example - cacheing results in PHP for faster loading

Here's an example from the last couple of days which is fully my own work, so I can share!

I was analysing a big data flow - yesterday's web log file in this case - and it was rather harsh on the server. No big shock about that - the log file's around 40Mbytes per day and I didn't have it in anything other than a normal text file. But it was rather silly to analyse it every time as the data only changes once every 24 hours.

Solution - let it run slowly the first time it's used after the log files are cycled, but then store the results in a cache and replay it from there each time. A user won't notice the first hit being slow if he can then call up other variants of the page at the blink of an eye!

You can try the code here (separate window) and chances are it will be very fast for you, as someone else will probably have been there recently. If not, the first time it will be slow then it will be fast. Full source code is available here.

Salient points:

1.
if (filemtime("ac_20090522") > @filemtime("cache_0.txt")) {

"is the log file newer that any cache." In the live demo, I have changed the code slightly to pick up yesterday's data every time. Note the "@" to suppress the warning message from filemtime if the cache file doesn't exit

2.
$fho = fopen("cache_0.txt","w");
fputs($fho,"$lines<%%>$result1<%%>$result2<%%>$result3\n");
fclose($fho);
}
# ------------- End of Code to set up cache --------------


"save the results to the cache". All the work of analysis has been done and the data for all the reports that might be called up for the next day is dumped into a file and then ...

3.
$parts = explode("<%%>",file_get_contents("cache_0.txt"));

"read back all the results from the cache". Note that I have NOT added a conditional - even if the cache file has just been generated, I let my code re-read it. Really I did that for testing purposes, but there's no harm in calling it back as - remember - reading the cache is FAST.

4.
Don't forget to make the cache file writable by the PHP!
(written 2009-05-24, updated 2009-05-26)

 
Associated topics are indexed as below, or enter http://melksh.am/nnnn for individual articles
H307 - PHP - Web2 and caching
  [1633] Changing a screen saver from a web page (PHP, Perl, OSX) - (2008-05-06)
  [1647] Exchange Rates - PHP with your prices in your users currency - (2008-05-19)
  [1733] memcached - overview, installation, example of use in PHP - (2008-08-02)
  [1812] Starting Ajax - easy example of browser calling up server data - (2008-09-27)
  [1813] Ajax - going Asyncronous and what it means - (2008-09-28)
  [1814] Javascript/HTML example, dynamic server monitor - (2008-09-28)
  [1926] Flash (client) to PHP (server) - example - (2008-12-06)
  [1995] Automated server heartbeat and health check - (2009-01-16)
  [2321] Uploading and Downloading files - changing names (Perl and PHP) - (2009-08-04)
  [2545] Scraping content for your own page via PHP - (2009-12-21)
  [3029] PHP data sources - other web servers, large data flows, and the client (browser) - (2010-11-04)
  [3094] Setting your user_agent in PHP - telling back servers who you are - (2010-12-18)
  [3186] How to add a customised twitter feed to your site - (2011-02-27)
  [3458] On this day ... one PHP script with three uses - (2011-09-26)
  [3955] Building up from a small PHP setup to an enterprise one - (2012-12-16)
  [3999] Handling failures / absences of your backend server nicely - (2013-02-08)
  [4055] Using web services to access you data - JSON and RESTful services - (2013-03-29)
  [4075] Further recent PHP examples - (2013-04-28)
  [4106] Web server efficiency - saving repetition through caches - (2013-05-30)
  [4136] How do I post automatically from a PHP script to my Twitter account? - (2013-07-10)
  [4627] Caching results in an object for efficiency - avoiding re-calculation - (2016-01-20)


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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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