Principle and Simple Application of Hook of hook in php Example of demo

In this paper, the principle and simple application of hook (hook) in php are described with examples. Share it for your reference, as follows:

Let's review the original development process first;

Product Wang has created a pile of demand;

When the user registers successfully, he needs to send short messages, send emails and so on;

Then the smart, witty and brave Cheng Xuyuan jumped on it;

Convert these requirements into code and throw them between successful user registration and jumping to the home page;

Nothing can stop it; Creative apes;

<?php
class Test{
  public function index(){
    //  User registration succeeded 
      /*
        Here is 1 Heap the code for sending short messages 
      */
      /*
        Here is 1 Code for Heap Sending Mail 
      */
      /*
        Here is 1 Code for other functions of the heap 
      */
    //  Go to the homepage of the website 
  }
}
$test=new Test();
$test->index();

If each function is performed by a different ape;

The first thing you face is that the code will be messy; It will be troublesome to cooperate;

Then encapsulate it as a function; 1 aspect will be standardized and neat; In addition, it is convenient to call repeatedly;

Nothing can stop it; Creative apes;

<?php
class Test{
  public function index(){
    //  User registration succeeded 
    //  Send a text message 
    sendSms($phone);
    //  Send Mail 
    sendSms($email);
    //  Other operations ...
    //  Go to the homepage of the website 
  }
}
/**
 *  Send SMS notification 
 * @param integer $phone  Mobile phone number 
 */
function sendSMS($phone){
  //  Here is the code for sending short messages 
}
/**
 *  Send mail notification 
 * @param string $email  Email address 
 */
function sendEmail($email){
  //  Here is the code to send the message 
}

At this time, the operation said;

If you can click a button in the background, you can set whether to send an email or send a short message; That must have been excellent;

Nothing can stop it; Creative apes;

<?php
class Test{
  public function index(){
    //  User registration succeeded 
    if (' If Send SMS is set up ') {
      //  Send a text message 
      sendSms($phone);
    }
    if (' If you set up Send Mail ') {
      //  Send Mail 
      sendSms($email);
    }
    //  Other operations ...
    //  Go to the homepage of the website 
  }
}
/**
 *  Send SMS notification 
 * @param integer $phone  Mobile phone number 
 */
function sendSMS($phone){
  //  Here is the code for sending short messages 
}
/**
 *  Send mail notification 
 * @param string $email  Email address 
 */
function sendEmail($email){
  //  Here is the code to send the message 
}

It is no problem to do this in a closed enterprise environment;

Ran goose; We also have an open and selfless ape leader who wants to open up the program for the benefit of other apes;

It is hoped that more apes will participate in this project; Co-development function;

If everyone changes this program; Throw your own code between the success of user registration and jumping to the home page;

This is obviously unreliable; Think about the confusion of 1 collapse and confusion;

Can you put your own code in a directory?

Then the system automatically loads these codes according to the configuration items between the user registration success and jumping to the home page?

Well, first define the following directory

plugin//Plug-in Directory
→ plugin1//Plug-in 1
Configuration Items for config. php//Plug-in 1
The program processing content of-index. php//Plug-in 1
→ plugin2
→ → config. php
→ → index. php
-plugin3
→ → config. php
→ → index. php
----...
index. php//Business Logic

Code for the business logic:

<?php
class Test{
  public function index(){
    //  User registration succeeded 
    //  Get all plug-ins 
    $pluginList=scandir('./plugin/');
    //  Loop plug-in  //  Exclude . ..
    foreach ($pluginList as $k => $v) {
      if ($v=='.' || $v=='..') {
        unset($pluginList[$k]);
      }
    }
    echo " Simple background management <hr>";
    //  Plug-in management 
    foreach ($pluginList as $k => $v) {
      //  Getting Configuration Items 
      $config=include './plugin/'.$v.'/config.php';
      $word=$config['status']==1 ? ' Click Close ' : ' Click Open ';
      echo $config['title'].'<a href="./index.php?change='.$v.'" rel="external nofollow" >'.$word.'</a><br />';
    }
    echo '<hr>';
    //  Output plug-in content 
    foreach ($pluginList as $k => $v) {
      //  Getting Configuration Items 
      $config=include './plugin/'.$v.'/config.php';
      if ($config['status']==1) {
        include './plugin/'.$v.'/index.php';
        //  Run plug-ins 
        Hook::run($v);
      }
    }
    //  Go to the homepage of the website 
  }
}
//  Plug-in class 
class Hook{
  //  Register to add plug-ins 
  public static function add($name,$func){
    $GLOBALS['hookList'][$name][]=$func;
  }
  //  Execute plug-in 
  public static function run($name,$params=null){
    foreach ($GLOBALS['hookList'][$name] as $k => $v) {
      call_user_func($v,$params);
    }
  }
}
//  Change plug-in status 
if (isset($_GET['change'])) {
  //  Getting to Configuration Items 
  $config=include './plugin/plugin'.substr($_GET['change'],-1).'/config.php';
  //  If it is turned on   Then close it   If it is closed   Open 
  $config['status']=$config['status']==1 ? 0: 1;
  //  Write the changed configuration item to a file 
  $str="<?php \\r\\n return ".var_export($config,true).';';
  file_put_contents('./plugin/'.$_GET['change'].'/config.php', $str);
  header('Location:./');
}
$test=new Test();
$test->index();

Plug-in configuration item code:

<?php
 return array (
 'status' => 1, //  Definition status  1 Indicates opening  0 Indicates closing 
 'title' => ' Send a text message ', //  The name of the plug-in 
);

Content of the plug-in:

That's right; This is the idea of plug-ins;

Of course, this is only a super simple example;

The complete plug-in mechanism should include plug-in type, database, audit and so on;

If you have used wordpress or domestic discuz;;

You will find that a good program is not just how good it is;

And what matters is how well the design expands; How convenient it is for everyone to expand its functions;

If you want to study plug-ins in depth; It is recommended to read the source code of wordpress and discuz.

For more readers interested in PHP related content, please check the topics on this site: "Introduction to php Object-Oriented Programming", "Encyclopedia of PHP Array (Array) Operation Skills", "Introduction to PHP Basic Syntax", "Summary of PHP Operation and Operator Usage", "Summary of php String (string) Usage", "Introduction to php+mysql Database Operation Skills" and "Summary of php Common Database Operation Skills"

I hope this article is helpful to everyone's PHP programming.