Joomla secondary development study notes

• Joomla directory structure

/administrator is the path to the management backend
/cache is the cache directory
/components is the component directory
/includes is an important directory, which contains various scripts, functions, etc. required for Joomla to run.
/language is the website language directory.
/plugins is the extension (trigger) directory. The
/modules directory is where module programs are stored. Joomla has defined more than ten module locations, such as header, footer, left, right, debug, user1, advert2, etc.
/templates template directory, each subdirectory inside corresponds to a template
/libraries class package directory, which are all important class files
/logs log directory, which stores the generated log script files
/images picture directory
/media directory is where various files are stored A place for media files.
/xmlrpc xml remote method call, using xml as the medium for calling remote methods
/tmp temporary directory

• Joomla! Component Structure

All components of Joomla! follow a specific naming scheme. Each system component has a unique name, and the name cannot include spaces.
The code is divided into two folders. The folder starts with com_, followed by the name of the component. eg: The component is called books. Therefore, you have to create two com_books folders with the same name
When the component is loaded in the foreground, Joomla! will look for the file componentname.php

Under the front components, the directory com_books and the file books.php.
Put it in the background administrator/components, directory com_books, file admin.books.php.

• Joomla! Interface introduction

Database operations: connect to the database - execute SQL statements - query data

1) Database operation to connect to the database
$db=& JFactory::getDBO();
2) Execute SQL statement
$sql="select * from #_tags";
$db->execute($sql);
3) Query data
$sql="select * from #_tags";
$db->setQuery($sql);
$rows=$db->loadObjectList();
foreach($rows as $row) {
echo $row->tag;
}

Session operation: Call Session

1) Get the value of Session
$session=&JFactory::getSession();
$name="session_name";
$sValue=$session->get($name);
2) Set the value of Session
$ session=JApplication::_createSession();
$name="session_name";
$value="alex";
$session->set($name,$value);

Joomla! Common database tables

Article categories
jos_categories
jos_sections

Joomla! Components, modules, plug-ins
jos_components
jos_modules
jos_plugins

Article
jos_content

Menu
jos_menu

Users and logins
jos_groups
jos_session
jos_users

The above introduces the Joomla secondary development study notes, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.