How to use sumproduct function How to implement website plug-in mechanism in PHP

The first is the implementation of the plug-in management class:

Copy the code The code is as follows:

/**
* STBLOG PluginManager Class
*
* The implementation core class of the plug-in mechanism
*
* @package STBLOG
* @subpackage Libraries
* @category Libraries
* @author Saturn
* @link http://www.cnsaturn.com /
*/
class PluginManager
{
/**
* Monitor registered plug-ins
*
* @access private
* @var array
*/
private $_listeners = array();
/**
* constructor
*
* @access public
* @return void
*/
public function __construct()
{
#Here the $plugin array contains the plug-in information we obtain that has been activated by the user
#For the convenience of demonstration, we assume that $ The plugin must contain at least
#$plugin = array(
# 'name' => 'Plug-in name',
# 'directory' => 'Plug-in installation directory'
#);
$plugins = get_active_plugins();# Please implement this function by yourself
if($plugins)
{
foreach($plugins as $plugin)
{//Assume that each plug-in folder contains an actions.php file, which is the specific implementation of the plug-in
if (@ file_exists(STPATH ​​.'plugins/'.$plugin['directory'].'/actions.php'))
{
include_once(STPATH ​​.'plugins/'.$plugin['directory'].'/actions.php ');
$class = $plugin['name'].'_actions';
if (class_exists($class))
{
//Initialize all plug-ins
new $class($this);
}
}
}
}
#Do some logging stuff here
}
/**
* Register the plug-in method (hook) that needs to be monitored
*
* @param string $hook
* @param object $reference
* @param string $method
*/
function register($hook, &$reference, $method)
{
//Get the method to be implemented by the plug-in
$key = get_class($reference).'->'.$method;
//Push the plug-in reference and the method into the listening array
$this->_listeners[$hook][$key] = array (&$reference, $method);
#Do some logging stuff here
}
/**
* Trigger a hook
*
* @param string $hook The name of the hook
* @param mixed $data The input parameters of the hook
* @return mixed
*/
function trigger($hook, $data='')
{
$result = '';
//Check whether the hook to be implemented is in the listening array
if (isset($this->_listeners[$hook]) && is_array($this->_listeners[$hook]) && count ($this->_listeners[$hook]) > 0)
{
// The loop call starts
foreach ($this->_listeners[$hook] as $listener)
{
// Take out the plug-in object References and methods
$class =& $listener[0];
$method = $listener[1];
if(method_exists($class,$method))
{
// Dynamically call the plug-in method
$result. = $class->$method($data);
}
}
}
#Do some logging stuff here
return $result;
}
}
?>

Then the plug-in Specific implementation method:

Copy the code The code is as follows:

/**
* This is an implementation of a Hello World simple plug-in
*
* @package DEMO
* @subpackage DEMO
* @category Plugins
* @author Saturn
* @link http://www.cnsaturn.com/
*/
/**
*A few default rules to note:
* 1. The file name of this plug-in class must be action
* 2. The name of the plug-in class must be {plugin name_actions}
*/
class DEMO_actions
{
//Analysis function The parameter is a reference to pluginManager
function __construct(&$pluginManager)
{
//Register this plug-in
//The first parameter is the name of the hook
//The second parameter is a reference to pluginManager
//The third is Methods executed by the plug-in
$pluginManager->register('demo', $this, 'say_hello');
}
function say_hello()
{
echo 'Hello World';
}
}
?>

For example, if I want to put say_hello on the homepage of my blog, Index.php, then you write somewhere in index.php: (author’s original words)

Copy the code The code is as follows:

$ pluginManager->trigger('demo','');

The above is the implementation of a plug-in mechanism, over!

The above introduces how to use the sumproduct function and how to implement the website plug-in mechanism in PHP, including the use of the sumproduct function. I hope it will be helpful to friends who are interested in PHP tutorials.