wordpress hooks are very important for wp developers. We can use the wp hooks in wordpress plugin and themes. Here in this article I will show you how to register the hook in wordpress plugin. I given the simple code sample which will give you the fare idea about using the wordpress hooks.

register activation hook using in wordpress plugin

register activation hook using in wordpress plugin

register activation hook using in wordpress plugin

register_activation_hook is very important function for creating the wordpress plugin. The function register_activation_hook registers a plugin function to be run when the plugin is activated.
You can use the register_activation_hook as follows:

<!--?<span class="hiddenSpellError" pre="" data-mce-bogus="1"-->php register_activation_hook($file, $function); ?>

If you can going to create the wordpress simple plugin then this function is very useful. this function you can use as follows in files.
If you have a function called myplugin_activate() in the main plugin file at either

* wp-content/plugins/myplugin.php or
* wp-content/plugins/myplugin/myplugin.php

you can use code as follows:

global $myvar;

function myplugin_activate() {
  global $myvar;
  echo $myvar; // this will be 'whatever'

register_activation_hook( __FILE__, 'myplugin_activate' );

1. register_activation_hook() must be called from the main plugin file – the one that has “Plugin Name: …” directive.
2. Your hook function must be in the same file as well. From that function it is ok to call other functions defined in other files.
3. Doing echo “My hook called!”; – does not work from it. So this is not a good way to judge whether it working or not.
4. Your global variables must be explicitly declared as global for them to be accessed from inside of my_activation_hook().

Check the sample wordpress plugin code.

<!--?<span class="hiddenSpellError" pre="" data-mce-bogus="1"-->php
Plugin Name: A Test
Description: A Test

require_once (dirname(__FILE__) . '/my_other_file.php');

// This code *will not* work. Activation hook function must be defined in the main plugin file.
//    register_activation_hook (dirname(__FILE__) . '/my_other_file.php', 'my_other_function');

// This code will work.
register_activation_hook (__FILE__, 'test_activated');

// This is correct way to declare/access globals.
global $some_var;    // globals must be declared explicitly. Without this you will not be able to access '$some_var' from within 'test_activated()' function.
$some_var = 'hey';

function test_activated ()
   global $some_var; // Now it will be 'hey'.

   // This function is defined in 'my_other_file.php'
   my_other_function ();

   // This will not work, so don't try. If you need logging write something in temporary log file in here via fopen/fwrite.
	// If you want to quickly test if your activation hook works - put exit() into it. At least you'll see error during activation.
   echo 'test_activated called!';


The function register_deactivation_hook registers a plugin function to be run when the plugin is deactivated.
following function will deactivate your plugin

register_deactivation_hook( __FILE__, 'myplugin_deactivate' );

Written by Purab

My name is Purab, Here is my Personal Blog: wpapi.com. I contributor of many wordpress plugins and Drupal Modules. I am core developer of Drupal. Connect to on LinkedIn or Follow @purab on Twitter or Follow me on Google+ or Write Mail to purabdk@gmail.com or Chat with me on Skype : purabdk

This article has 2 comments

  1. Tawnya

    Woah! I’m really loving the template/theme of this site. It’s simple, yet effective. A lot of times it’s hard to get that “perfect balance” between superb usability and visual appearance. I must say that you’ve done a great job with this. In addition, the blog loads very fast for me on Safari. Superb Blog!

  2. Irvin

    This is the perfect web site for everyone who would like to find out about this topic. You know so much its almost hard to argue with you (not that I actually would want to…HaHa). You certainly put a brand new spin on a topic which has been discussed for a long time. Wonderful stuff, just wonderful!