How To Implement Webhooks in PHP?

Hooks within the PHP provides us the mean to tap and modify the inner workings of the frame without hacking the root or main files. Hooks follow a specific execution process. There are instances where we are likely to cause some action to take place at a particular point. For example, you want the script to run, right before your controllers get loaded or right after you want one of the scripts in your code to execute.

Hooks are also known as plugins or extensions and extend the functionality of the existing code. You can plug the hook into the existing system and can boost its functionality. Therefore Hooks are also known as Plugins, Add-Ons, or Extensions. Hooks pass the control to the add on and are declared using the following code.

fn_set_hook(‘hook_name’, $params, [$param2], [$param1]);

How to Enable Hooks?

Hooks within the PHP or any other PHP Framework can be enabled or disabled by setting the following item in the application/config/config.php.

$config[‘enable_hooks’]=TRUE;

How To Define Hooks?

Hooks are defined in the application/config/hooks.php file in the manner listed below.

$hook[‘pre_controller’]=array(

‘class’ =>’MyClass’,

‘function’ =>’MyFunction’,

‘filename’ => ‘MyClass’,

‘Filepath’ =>’hooks’,

‘pararms’=>array(‘beer’, ‘wine’, ‘snacks’)

);

How to call the same hook multiple times?

If you want to use the same hook with more than one script, simply make the array multi-dimensional.

Brackets after each array index.

$hook[‘pre_controller’][]

In this way, you can have the same hook multiple times, The order you define in the array matters a lot in the same way your hook will get execute.

Hook Points

The following is the list of hook points.

pre_system

it is called very early during system execution. Benchmarks and hook points are loaded at this stage. Either routing or any other process will not happen.

pre_controller

pre_controller is called immediately before any of the controllers being called. In this case, all base class, routing, and security checks have been done before.

post_controller_constructor

post_controller_constructor is called immediately after your controller is executed. But before any other method calls happen.

post_controller

post_controller is called immediately after the controller is 100% executed.

display_override

display_override the display_function. It is used to send the finalize page to the web browser at the end of system execution. It allows you to use your own display methodology. However, you need to reference the CI super object with

$this->CI=$get_instance()

Then you can make available the finalized data by calling.

$this->CI->output->get_output()

Cache Override

Cache Override allows you to call your own function rather than the display_cache() function in the output class. It allows you to use your own cache display mechanism.

POST_System

POST_System is called after the final recorded page is sent to the web browser at the end of the system execution after the final data is sent to the web browser.

Advantages of Hooks:

Hooks are also known as Filters or Actions and are used by the developers to make changes within the website without editing the core files. Hooks are used within PHP as well as WordPress and are used to create or add custom functions or edit and remove the existing functions.

Hooks allow you to perform the following three operations.

  • Edit Function.
  • Remove Function.
  • Add Function.

Hooks allow the add ons to perform additional tasks between the middle of the code. Using the hook, any add-on can make an interception in the middle of the code, perform the necessary functions, and then revert to the execution of the program. When the hook is called, all variables defined in the hook become available for the addon.

Hooks allow WordPress as well as PHP Developers to make changes to the core files using the custom coding and not weakens the core files of WordPress or theme. PHP is heavily based on the WordPress Plugin API and most of the code comes from there.

The major advantage of hooks is that each time you update WordPress your core changes are not lost that can be caused if you edit the WordPress Core Files.

You create custom code using Hooks and is placed in your child theme, functions.php file, which is by the way not affected when you update plugins or WordPress Core Files. However, you need to update the file you are editing within the theme in order to save.

Types of Hooks

There are two types of Hooks within WordPress, filters, and actions. Filters allow you to add_filters() in order to filter some default functions while leaving the other functions active.

  • Filter Hook
  • Action Hook

Actions Hook within WordPress allows you to add functions using add_function and can also be used to remove using the functions remove_actions().

Action Code allows you to add custom code like HTML to a particular location.

How To Find Hooks Within PHP?

Hooks are amazing functionality within PHP and are used to extend the existing performance of the code. However, most of the designers and developers are reluctant to Hooks and tend to avoid them. The upcoming article will allow you to understand code snippets with hooks such as found in forums, plugins, and themes, extend the WordPress functionality, extend the WordPress functionality without breaking updates, and this article will also allow you to avoid problems with hooks, at the same time allowing you to extend your code.

Hooks are used for a wide variety of purposes. The do hook is an action. Whenever an action is defined you can execute your code. The real-world examples of the functionality of hooks are added instructions above the login form e.g. invalid password, load a custom script file in the middle of the code, and send an email to the author once the post is published.

However, the position of hooks matters a lot. Action hooks are eligible all over WordPress and allow you to anything. While the do hook is an action, the customize hook is the filter. A filter allows you to customize a value and return it in a new form. For example, changing an option after retrieving it from the database, can attach links to the post after the main content, and can capitalize on a post’s title.

Not only the position is crucial for the filter, but also the given and returned value. There is a filter in WordPress for almost every value it processes.

Most of the times, there are a lot of options in the plugin, in this case, you can find the hook by applying the filter. In this case, you can call apply_filters() for every option. Besides, you can also use the idea of a dynamic hook name as WordPress Core do the same in the get_options function.

For Example, WordPress Files contains the following hooks.

‘pre_option_’ .$option

‘default_option_’.$option

‘option_’ .$option
In this particular case, you can hook into option_blogname or option_blogdescription to either change the name or description of the blog dynamically.

Function Names

Upon calling a plain function, it is wise to add a prefix to it. Adding the prefix will prevent conflicts with other functions.

You have noticed most of the times in Forums that functions name starts with _my. It is better to change it and give it the name that the latter proves better for in way of memorizing.

WordPress currently has 1957 Hooks in accordance with Adam Brown’s Hook Database. However, there is no need to learn them. But it must be known to you that whatever you are trying to add or remove there is a hook specified for it.

In order to get started, you have to explore the functions that you are using in your existing code like the_content() and wp_head(). The Plugin API Page of WordPress list all the important functions as well as their details.

Conclusion

We have guided you in detail on Hooks and provides you with knowledge that you don’t know before. However, if the problem persists and you are unable to find Hooks. Just Ping us at usama@maxenius.com or Simply WhatsApp 0322-8661367 and define your problem for the instant solution.

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