Local mods to Zend Framework should be subclassed

[anonymous-matomo-user]

i have tried to use piwik in a zend framework project so i have copy the example on the [Calling the API From within PHP](http://dev.piwik.org/trac/wiki/API/CallingTechniques) page and paste it in a zf controller
after hacking the include_path to avoid ‘cannot redeclare class exception’ (see #631)

then i got the following error :

```
Fatal error: Call to undefined method Zend_Db_Adapter_Pdo_Mysql::resetConfigArray() in D:\WORK\SITES WEB\JC2\SRC\lib\piwik\core\Piwik.php on line 1184

—> Piwik::createDatabaseObject( ) ..\FrontController.php:234
```

Matthieu said on the forum that’s because resetConfigArray() is a custom method from piwik, but now the classes are added from the standart library used for the whole project.
i suggest any custom method like this one to be moove in new classes extending the original classes (eg Zenwik_Db_Adpater)

while looking at this i also noticed that piwik is using Zend_Registry to store data throw the process.
Any user using already zf will surely use Zend_Registry too so every entry in it should be prefixed to avoid scope issue

```
Zend_Registry::set(‘piwik_config’,$config)
```

maybe something similar should be done for zend_session and zend_auth

PS : maybe same pb can happen with other third party librarys (smarty is used a lot too …)

[mattab]

(In ¹⁰³⁰) – renaming all constants that were not prefixed by PIWIK_ refs #632

[robocoder]

co-depends in #497

[robocoder]

Adding resetConfigArray() to Zend_Db_Adapter_Abstract is much cleaner/simpler than subclassing all the adapters and changing the factory to use our subclassed adapters. I'll add a method_exists() check.

[robocoder]

In [1453], check that resetConfigArray() method exists

[mattab]

I think we might be able to call _construct() with empty parameter, rather than having to keep the hack ->resetConfig()

I will investigate

[robocoder]

In [1465], fixes #632 - move local mods to subclassed ZF classes; the duplication in Db/Mysqli.php and Db/Pdo/Mysql.php is unavoidable because PHP doesn't support multiple inheritance