Comments on: PHP Performance Series: Caching Techniques

By: Basic Thinking Blog | Wochenende

Basic Thinking Blog | Wochenende — Sat, 26 Apr 2008 10:53:25 +0000

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By: Mike Willbanks

Mike Willbanks — Thu, 28 Feb 2008 18:49:55 +0000

@Herve -
That is true, however, this is about knowing your data set as well as the results it is returning. I updated the examples based on your feed back. However:

if ($Cache_Lite->get($id) === false) {

Is in efficient because then you would also have to do that same thing again to retrieve the value. The following would be better (however, less readable):

if (($var = $Cache_Lite->get($id)) === false) {

You could certainly write the above in 2 lines but I like the single line for simplicity sakes. Here is the two line version:

$var = $Cache_Lite->get($id);
if ($var === false) {

By: Herve

Herve — Thu, 28 Feb 2008 17:55:11 +0000

With Pear Cache_lite, this kind of examples should not exist anymore :

if (!($categories = $cache->get(’categories’))) {

You can have 0 as a result of an Sql query or from anything else and in this case, the test is wrong.
In your test, you should use a strict comparaision like :
if ($Cache_Lite->get($id) === false) {
}