NYCPHP Meetup

[Joseph Crawford]

Dan,

thanks for pointing this out, however one question,  I have been told
that in PHP 4 static variables in functions are not stored from page
to page request, if this is true you will need to use a session anyhow
so why would singletons be of use in php 4?

the article you saw is one that was not updated yet, i sent an email
to the site admin with corrections for the article that also showed a
way to use a session to store the object.

i will add your code to the code example and note your name ;)


On Wed, 22 Sep 2004 09:22:07 -0400, Dan Cech <dcech at phpwerx.net> wrote:
> Joseph Crawford wrote:
> > also i would like to note that i havent really found a use for that
> > singleton pattern shown before in php 4, rather here is another code
> > example i posted that will show a better way to use a method to get
> > similar results.
> >
> > http://www.weberdev.com/get_example-4014.html
> 
> You may be better off with something like this:
> 
> function &singleton($class) {
>      static $instances;
> 
>      if (!is_array($instances)) {
>          $instances = array();
>      }
> 
>      if (!isset($instances[$class])) {
>          $instances[$class] =& new $class;
>      }
> 
>      return $instances[$class];
> }
> 
> This function will correctly manage multiple singleton objects for
> multiple classes, thus:
> 
> $mysingle =& singleton('myclass');
> 
> $myother =& singleton('anotherclass');
> 
> Will both be valid singleton instances of their respective class.  With
> the function in your example the second call to singleton would change
> the object referenced by $mysingle.
> 
> I also changed the way the function returns the reference slightly to
> reflect the preferred syntax in php4.
> 
> Dan
> 
> 
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> 



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Joseph Crawford Jr.
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