I have a development system, display\_errors is on, Magento is in developer mode and I tried to

```
Mage::log($layered_navigation_filter_block); // Mage_Catalog_Block_Layer_Filter_Attribute

```

And everything was written to the screen instead of the log file, why?

It looks like this case:

```
// app/Mage.php:837
if (is_array($message) || is_object($message)) {
    $message = print_r($message, true);
}

```

but the second argument from the print\_r is ignored:

```
Mage_Catalog_Block_Layer_Filter_Category Object ( [_filter:protected] => ...

```

```
[28-Jan-2013 22:48:43 UTC] PHP Fatal error:  Allowed memory size of 268435456 bytes exhausted (tried to allocate 241434624 bytes) in /var/www/app/code/local/MyCompany/Motif/Model/Observer.php on line 47
[28-Jan-2013 22:48:43 UTC] PHP Stack trace:
[28-Jan-2013 22:48:43 UTC] PHP   1. {main}() /var/www/index.php:0
[28-Jan-2013 22:48:43 UTC] PHP   2. Mage::run() /var/www/index.php:87
[28-Jan-2013 22:48:43 UTC] PHP   3. Mage_Core_Model_App->run() /var/www/app/Mage.php:683
[28-Jan-2013 22:48:43 UTC] PHP   4. Mage_Core_Controller_Varien_Front->dispatch() /var/www/app/code/core/Mage/Core/Model/App.php:354
[28-Jan-2013 22:48:43 UTC] PHP   5. Mage_Core_Controller_Varien_Router_Standard->match() /var/www/app/code/core/Mage/Core/Controller/Varien/Front.php:176
[28-Jan-2013 22:48:43 UTC] PHP   6. Mage_Core_Controller_Varien_Action->dispatch() /var/www/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php:250
[28-Jan-2013 22:48:43 UTC] PHP   7. Mage_Catalog_CategoryController->viewAction() /var/www/app/code/core/Mage/Core/Controller/Varien/Action.php:419
[28-Jan-2013 22:48:43 UTC] PHP   8. Mage_Core_Controller_Varien_Action->generateLayoutBlocks() /var/www/app/code/core/Mage/Catalog/controllers/CategoryController.php:146
[28-Jan-2013 22:48:43 UTC] PHP   9. Mage_Core_Model_Layout->generateBlocks() /var/www/app/code/core/Mage/Core/Controller/Varien/Action.php:344
[28-Jan-2013 22:48:43 UTC] PHP  10. Mage_Core_Model_Layout->generateBlocks() /var/www/app/code/core/Mage/Core/Model/Layout.php:210
[28-Jan-2013 22:48:43 UTC] PHP  11. Mage_Core_Model_Layout->_generateBlock() /var/www/app/code/core/Mage/Core/Model/Layout.php:205
[28-Jan-2013 22:48:43 UTC] PHP  12. Mage_Core_Model_Layout->addBlock() /var/www/app/code/core/Mage/Core/Model/Layout.php:239
[28-Jan-2013 22:48:43 UTC] PHP  13. Mage_Core_Model_Layout->createBlock() /var/www/app/code/core/Mage/Core/Model/Layout.php:472
[28-Jan-2013 22:48:43 UTC] PHP  14. Mage_Core_Block_Abstract->setLayout() /var/www/app/code/core/Mage/Core/Model/Layout.php:456
[28-Jan-2013 22:48:43 UTC] PHP  15. Mage::dispatchEvent() /var/www/app/code/core/Mage/Core/Block/Abstract.php:239
[28-Jan-2013 22:48:43 UTC] PHP  16. Mage_Core_Model_App->dispatchEvent() /var/www/app/Mage.php:447
[28-Jan-2013 22:48:43 UTC] PHP  17. Mage_Core_Model_App->_callObserverMethod() /var/www/app/code/core/Mage/Core/Model/App.php:1317
[28-Jan-2013 22:48:43 UTC] PHP  18. MyCompany_Motif_Model_Observer->coreBlockAbstractPrepareLayoutAfter() /var/www/app/code/core/Mage/Core/Model/App.php:1338
[28-Jan-2013 22:48:43 UTC] PHP  19. print_r() /var/www/app/code/local/MyCompany/Motif/Model/Observer.php:47

```

Ok, a fatal error happens, no shutdown\_function is registered, so why is the print\_r echoed? :-) I still don't understand what is happening.