WP - Prevent plugin updates

readme.md

Useful when you modify a plugin, and don't want another WP admin to update it, discarding your changes.

1. Add this snippet at the top of your plugin's main file.
2. Replace xyz for some short version of your plugin's name
3. That's it. See screenshot:

plugin.php

<?php 

// Block the admin from updating this plugin, as we've modified it.
add_filter('site_transient_update_plugins', function ($value) {
    $plugin = plugin_basename(__FILE__);
    if (!isset($value->response[ $plugin ])){ return $value; }    
    add_action( "in_plugin_update_message-$plugin", function ($plugin_data){
        echo " A customized version is being used. Please contact your developer for updates.";
    });
    unset($value->response[ $plugin ]->package); // Remove ->package to fully remove the update notice.
    return $value;
});