Disable Wordpress Zopim/Zendesk Chat footer injection when Monitoring

disable_zopim.php

<?php
/*
Plugin Name: Disable zopim when monitoring
Plugin URI: http://riotsupport.co.uk
Description:  Removes zopim footer from pages with '--monitoring__tool__testing--' in the URL
Author: Matt Harvey
Version: 1.0
Author URI: http://riotsupport.co.uk
*/

add_action( 'wp_footer', 'lg_disable_zopim_plugin', 1 );

function lg_disable_zopim_plugin(){
  if(strpos($_SERVER['REQUEST_URI'], '--monitoring__tool__testing--') > 0) {
    remove_action( 'wp_footer', array( 'Zopim_Widget', 'zopimme' )); 
  }
}