PHP Plugin Technology-plug-in hook (hooks) analysis

Recently prepared to do an open-source personal blog system, because in the idea of adding plug-in functionality, so the plug-in function to study the implementation method.

Plug-in function according to my own understanding is the existing program to add and improve the function, plug-in to the interface provided by the program to connect, and then through the interface has been connected to the program's data and so on to modify.

and the role of plug-in hook is similar to a plug-in interface, plug-in and the corresponding hooks in the program to connect, the program provides content to modify.

My plug-in mechanism is all based on the object-oriented approach to the schema, in the beginning to initialize the plug-in, is to use an array to store the name of the plug-in for subsequent hooks to invoke.

$plug _config[]=array (    ' plug_name ' = ' oneplug ',    ' plug_version ' = ' 1.01 ');

This plugin function I just want to add a nice look to a piece of HTML content, plugins I put in the./root/ext folder, with the plug-in name as the name of the plug-in folder, main.php as the main invocation portal of the plug-in.

Inside the plugin is a class with the name of the plugin.

 
  ', $plug _tem_global);                $plug _tem_global= '. Implode ("

", $temarr).";}                    

This global $plug _tem_global; is to use a global variable $plug_tem_global as the parameter of the incoming content, modify it to be equivalent to modify the content.

In the plug-in mechanism of the main file, plug-in hook as a call plug-in interface, it is actually a string variable, its internal value is the name of the array to insert the current location plug-in

For example, the plug-in initialization of the array name is Plug_config, then the plug-in hook here is $plug_config, because of the inside of the class to manipulate the variable, so use global to turn him into a global variable.

$plug _point_name= ' Plug_config '; global $ $plug _point_name;

For plug-in execution, a loop is used internally to execute all plugins that apply to the current hook

$plug _tem_arr=$ $plug _point_name $plug _num=count ($plug _tem_arr); for ($plug _i=0; $plug _i< $plug _num; $plug _i++) {    if (isset ($plug _tem_arr[$plug _i][' plug_name ')) {        $plug _name= $plug _tem_arr[$plug _i][' plug_name '];        $plug _file_address=root. ' ext '. Directory_separator. $plug _name. Directory_separator. ' Main.php ';        if (file_exists ($plug _file_address)) {            require ($plug _file_address);            $plug _tem_obj=new $plug _name ();}}    

Below is I do not use plug-ins and use the effect of the plug-in comparison, haha ~ Once there is a mountain ...

