Class To Disable WordPress Plugins By URL - Disable specified plugins except for certain pages - enhanced with caching. http://www.damiencarbery.com/2019/03/class-to-disable-wordpress-plugins-by-url/

disable-plugins-by-url.php

<?php
/*
Plugin Name: Class To Disable WordPress Plugins By URL
Plugin URI: http://www.damiencarbery.com/2019/03/class-to-disable-wordpress-plugins-by-url/
Description: Disable specified plugins except for certain pages - enhanced with caching.
Version: 0.1
Author: Damien Carbery
Author URI: http://www.damiencarbery.com/
*/

class DisablePluginsByUrl {

	// A reference to an instance of this class.
	private static $instance;
	
	// List of plugins to disable and the excluded urls.
	private $disable_plugins;
	// List of permitted plugins.
	private $permitted_plugins;
	// Whether list of permitted plugins has been populated.
	private $permitted_list_set;


	// Returns an instance of this class. 
	public static function get_instance() {
		if ( null == self::$instance ) {
			self::$instance = new DisablePluginsByUrl();
		} 
		return self::$instance;
	} 


	// Initialize the plugin variables.
	public function __construct() {
		
		$this->permitted_plugins = null;
		$this->permitted_list_set = false;

		$this->disable_plugins = array (
		  // Plugin Name => Urls *not* to disable on.
		  'contact-form-7/wp-contact-form-7.php' => array( '/wp-json/contact-form-7/', '/contact/' ), // /wp-json url needed to send messages
		  //'advanced-custom-fields-pro/acf.php' => array( '/page-one/', '/page-two/', '/page-three/' ),
		  'query-monitor/query-monitor.php' => array( '/standalone/2018/' ),
		);

		$this->init();
	}


	// Set up WordPress specfic actions.
	public function init() {
		if ( ! is_admin() ) {
			add_filter( 'option_active_plugins', array( $this, 'disable_plugins_per_page' ) );
		}
	}


	// Determine whether to permit or prohibit the plugins for this url.
	public function disable_plugins_per_page( $plugin_list ) {
		// Short circuit this function if the list of permitted
		// plugins has already been determined.
		if ( $this->permitted_list_set ) {
			return $this->permitted_plugins;
		}

		$plugins_to_disable = array();
		foreach ( $plugin_list as $plugin ) {
			// If the active plugin is in the list that we are
			// interested in then check its list of excluded urls.
			if (true == array_key_exists( $plugin, $this->disable_plugins ) ) {
				//error_log( "Found $plugin in list of active plugins." );
				$enable_plugin_for_this_url = false;

				//error_log( "Check $plugin urls: " . var_export( $this->disable_plugins[ $plugin ], true ) );
				foreach ( $this->disable_plugins[ $plugin ] as $whitelist_url ) {
					//error_log( "Check if $whitelist_url starts with ".$_SERVER['REQUEST_URI'] );

					if ( 0 === strpos( $_SERVER['REQUEST_URI'], $whitelist_url ) ) {
						//error_log( "It does so enable the plugin for this url." );
						$enable_plugin_for_this_url = true;
					}
				}
				if ( ! $enable_plugin_for_this_url ) {
					//error_log( "Disable $plugin on ".$_SERVER['REQUEST_URI']."." );
					$plugins_to_disable[] = $plugin;
				}
				else {
					//error_log( "Enable $plugin for " . $_SERVER['REQUEST_URI'] );
				}
			}
		}

		// If there are plugins to disable then remove them from the list,
		// otherwise return the original list.
		if ( count( $plugins_to_disable ) ) {
			$this->permitted_plugins = array_diff( $plugin_list, $plugins_to_disable );
			$this->permitted_list_set = true;

			return $this->permitted_plugins;
		}
		else {
			$this->permitted_plugins = $plugin_list;
			$this->permitted_list_set = true;

			return $this->permitted_plugins;
		}
	}
} 

$DisablePluginsByUrl = new DisablePluginsByUrl;

disable-plugins-for-specified-urls.php

<?php
/*
Plugin Name: Class To Disable WordPress Plugins By URL
Plugin URI: http://www.damiencarbery.com/2019/03/class-to-disable-wordpress-plugins-by-url/
Description: Disable specified plugins *only* for certain pages - enhanced with caching.
Version: 0.1
Author: Damien Carbery
Author URI: http://www.damiencarbery.com/
*/


class DisablePluginsByUrl {

	// A reference to an instance of this class.
	private static $instance;
	
	// List of plugins to disable and the excluded urls.
	private $disable_plugins;
	// List of permitted plugins.
	private $permitted_plugins;
	// Whether list of permitted plugins has been populated.
	private $permitted_list_set;


	// Returns an instance of this class. 
	public static function get_instance() {
		if ( null == self::$instance ) {
			self::$instance = new DisablePluginsByUrl();
		} 
		return self::$instance;
	} 


	// Initialize the plugin variables.
	public function __construct() {
		
		$this->permitted_plugins = null;
		$this->permitted_list_set = false;

		$this->disable_plugins = array (
		  // Plugin Name => Urls to disable on.
		  'plugindir/pluginfile.php' => array( '/dashboard/' ),
		);

		$this->init();
	}


	// Set up WordPress specfic actions.
	public function init() {
		if ( ! is_admin() ) {
			add_filter( 'option_active_plugins', array( $this, 'disable_plugins_per_page' ) );
		}
	}


	// Determine whether to permit or prohibit the plugins for this url.
	public function disable_plugins_per_page( $plugin_list ) {
		// Short circuit this function if the list of permitted
		// plugins has already been determined.
		if ( $this->permitted_list_set ) {
			//echo( '<p>Permitted list set so return it.</p>' );
			return $this->permitted_plugins;
		}

		$plugins_to_disable = array();
		foreach ( $plugin_list as $plugin ) {
			// If the active plugin is in the list that we are
			// interested in then check its list of excluded urls.
			if (true == array_key_exists( $plugin, $this->disable_plugins ) ) {
				//error_log( "Found $plugin in list of active plugins." );
				$disable_plugin_for_this_url = false;

				//error_log( "Check $plugin urls: " . var_export( $this->disable_plugins[ $plugin ], true ) );
				foreach ( $this->disable_plugins[ $plugin ] as $whitelist_url ) {
					//error_log( "Check if $whitelist_url starts with ".$_SERVER['REQUEST_URI'] );
					//echo( "<p>Check if $whitelist_url starts with ".$_SERVER['REQUEST_URI'] . '</p>' );
					//echo( "<p>Check if ".$_SERVER['REQUEST_URI']." starts with $whitelist_url</p>" );

					//if ( 0 !== strpos( $_SERVER['REQUEST_URI'], $whitelist_url ) ) {
					//if ( 0 === strpos( $whitelist_url, $_SERVER['REQUEST_URI'] ) ) {
					if ( 0 === strpos( $_SERVER['REQUEST_URI'], $whitelist_url ) ) {
						//error_log( "It does so enable the plugin for this url." );
						//echo( "<p>It does so disable the plugin for this url.</p>" );
						$disable_plugin_for_this_url = true;
					}
				}
				if ( $disable_plugin_for_this_url ) {
					//error_log( "Disable $plugin on ".$_SERVER['REQUEST_URI']."." );
					//echo( "<p>Disable $plugin on ".$_SERVER['REQUEST_URI'].".</p>" );
					$plugins_to_disable[] = $plugin;
				}
				else {
					//error_log( "Enable $plugin for " . $_SERVER['REQUEST_URI'] );
					//echo( "<p>Enable $plugin for " . $_SERVER['REQUEST_URI'] . '</p>' );
				}
			}
		}

		// If there are plugins to disable then remove them from the list,
		// otherwise return the original list.
		if ( count( $plugins_to_disable ) ) {
			$this->permitted_plugins = array_diff( $plugin_list, $plugins_to_disable );
			$this->permitted_list_set = true;

			return $this->permitted_plugins;
		}
		else {
			$this->permitted_plugins = $plugin_list;
			$this->permitted_list_set = true;

			return $this->permitted_plugins;
		}
	}
} 

$DisablePluginsByUrl = new DisablePluginsByUrl;