magentoappdesignfrontendbasedefaulttemplatecatalogproductwidgetnewcontent

read the following file can know more about the route and flow

store/app/code/core/Mage/Core/Controller/Varien/Front.php <== front controller store/app/code/core/Mage/Core/Model/App.php <== (Main) App Model (Object) about REFERENCE : 即係跳 block 專用技
Diagram 3

is used to make reference to another block. By making a reference to another block, the updates inside will apply to the it correlates to (see diagram 3).

In order to make the reference, you must target the reference to a block by using the ‘name’ attribute. This attribute targets the tag’s ‘name’ attribute. So if you were to make a reference by , you’re targeting the block called .

need some tricks:

http://www.redlightblinking.com/blog/magento-debugging-how-to-debug-template-paths-logging-and-display-errors

MAGENTO DEBUGGING – HOW TO DEBUG TEMPLATE PATHS, LOGGING AND DISPLAY ERRORS
Categories: Blog, Magento
Developing in Magento without these debugging tips can be challenging! Here is how you can debug magento:

Turn on Template Path Hints
Turn on error/system logging
Turn on SQL logging
Display PHP errors

Turn on Template Path Hints

Would you like to see the path of the file that is producing the HTML for each block on the page?

1. Log into the admin

2. Goto -> System ->Configuration, and on the bottom of the list select “Developer”

3. click on Debug – you will only see “Profiler”. Here is the trick – you have to switch the “Current Configuration Scope:” [in the upper left] to a website instead of default. Select “Main Website”.

4. Now you will see the selection for Template Path Hints – check yes. This will display the path of the template for each block of the page so you can find stuff! You can also choose to “Add Block Names to Hints” to see the corresponding model class for the block.

Turn on error/system logging

1. In the admin Goto -> System ->Configuration, and on the bottom of the list select “Developer”

2. Select the Log Settings tab and put Enabled = Yes

3. *to avoid any permissions issues, create folder/file

/var/log/system.log

Turn on SQL logging

To enable SQL Debugging find the file

/lib/Varien/Db/Adapter/Pdo/Mysql.php

change line 45
protected $_debug = false;

to
protected $_debug = true;

It will then generate the file var/debug/sql.txt.

*If you have any issues create this file manually first…

Display PHP errors

Frustrated you can’t see your PHP errors? This is how you turn them on – for development use only, don’t do this on a production site!

In Index.php change

Mage::setIsDeveloperMode(true);

ini_set(‘display_errors’, 1);