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Description

The upgrader_process_complete action hook is run when the download process for a plugin install or update finishes.

It is passed two arguments: an instance of the WP_Upgrader() class and the $hook_extra array.

Use with caution: When you use the upgrader_process_complete action hook in your plugin and your plugin is the one which under upgrade, then this action will run the old version of your plugin.

PARAMETERS

   my_upgrade_function( $this, $data )

   $this - (Plugin_Upgrader) Plugin_Upgrader instance. In other contexts, $this, might be a Theme_Upgrader or Core_Upgrade instance.
   $data (array)
       'action'   -(string) Type of action. Default 'update'.
       'type'     -(string) Type of update process. Accepts 'plugin', 'theme', or 'core'.  Default:'plugin'
       'bulk'     - (bool) Whether the update process is a bulk update. Default true.
       'packages' -  (array) Array of plugin, theme, or core packages to update.

Example

add_action( 'upgrader_process_complete', 'my_upgrade_function',10, 2);

function my_upgrade_function( $upgrader_object, $options ) {
    $current_plugin_path_name = plugin_basename( __FILE__ );

    if ($options['action'] == 'update' && $options['type'] == 'plugin' ){
       foreach($options['plugins'] as $each_plugin){
          if ($each_plugin==$current_plugin_path_name){
             // .......................... YOUR CODES .............

          }
       }
    }
}

This short plugin demonstrates how to display a notice to the user when they update the plugin. It displays a different notice when they first install the plugin:

<?php
/*Plugin Name: Upgrader Process Example
Plugin URI: https://catapultthemes.com/wordpress-plugin-update-hook-upgrader_process_complete/
Description: Just an example of using upgrader_process_complete
Version: 1.0.0
Author: Catapult Themes
Author URI: https://catapultthemes.com/
Text Domain: wp-upe
Domain Path: /languages*/

// Exit if accessed directly
if ( ! defined( 'ABSPATH' ) ) {
 exit;
}

/**
 * This function runs when WordPress completes its upgrade process
 * It iterates through each plugin updated to see if ours is included
 * @param $upgrader_object Array
 * @param $options Array
 */
function wp_upe_upgrade_completed( $upgrader_object, $options ) {
 // The path to our plugin's main file
 $our_plugin = plugin_basename( __FILE__ );
 // If an update has taken place and the updated type is plugins and the plugins element exists
 if( $options['action'] == 'update' && $options['type'] == 'plugin' && isset( $options['plugins'] ) ) {
  // Iterate through the plugins being updated and check if ours is there
  foreach( $options['plugins'] as $plugin ) {
   if( $plugin == $our_plugin ) {
    // Set a transient to record that our plugin has just been updated
    set_transient( 'wp_upe_updated', 1 );
   }
  }
 }
}
add_action( 'upgrader_process_complete', 'wp_upe_upgrade_completed', 10, 2 );

/**
 * Show a notice to anyone who has just updated this plugin
 * This notice shouldn't display to anyone who has just installed the plugin for the first time
 */
function wp_upe_display_update_notice() {
 // Check the transient to see if we've just updated the plugin
 if( get_transient( 'wp_upe_updated' ) ) {
  echo '<div class="notice notice-success">' . __( 'Thanks for updating', 'wp-upe' ) . '</div>';
  delete_transient( 'wp_upe_updated' );
 }
}
add_action( 'admin_notices', 'wp_upe_display_update_notice' );

/**
 * Show a notice to anyone who has just installed the plugin for the first time
 * This notice shouldn't display to anyone who has just updated this plugin
 */
function wp_upe_display_install_notice() {
 // Check the transient to see if we've just activated the plugin
 if( get_transient( 'wp_upe_activated' ) ) {
  echo '<div class="notice notice-success">' . __( 'Thanks for installing', 'wp-upe' ) . '</div>';
  // Delete the transient so we don't keep displaying the activation message
 delete_transient( 'wp_upe_activated' );
 }
}
add_action( 'admin_notices', 'wp_upe_display_install_notice' );

/**
 * Run this on activation
 * Set a transient so that we know we've just activated the plugin
 */
function wp_upe_activate() {
 set_transient( 'wp_upe_activated', 1 );
}
register_activation_hook( __FILE__, 'wp_upe_activate' );

The following is example data of the 2nd parameter passed to this hook (as of 4.8.1):

Array
(
    [action] => update
    [type] => plugin
    [bulk] => 1
    [plugins] => Array
        (
            [0] => wordpress-beta-tester/wp-beta-tester.php
        )

)