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Editing: init.php

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<?php
/**
 * If Cloud version is enabled we can stop here to save resources used from Local.
 * When Cloud is active we still need to load init on Local admin manu page.
 * When Local is active we don't need to load on Cloud admin menu page.
 */
if ( empty( WPMUDEV_BLC\App\Options\Settings\Model::instance()->get( 'use_legacy_blc_version' ) ) ) {
	if ( empty( $_GET['page'] ) || WPMUDEV_BLC\App\Admin_Pages\Local_Submenu\Controller::instance()->get_menu_slug() !== $_GET['page'] ) {
		if ( ! WPMUDEV_BLC\Core\Utils\Utilities::is_subsite() ) {
			return;
		}
	}
} else if ( ! empty( $_GET['page'] ) && WPMUDEV_BLC\App\Admin_Pages\Local_Submenu\Controller::instance()->get_menu_slug() !== $_GET['page'] ) {
	if ( WPMUDEV_BLC\Core\Utils\Utilities::is_subsite() ) {
		return;
	}
}

// To prevent conflicts, only one version of the plugin can be activated at any given time.
if ( defined( 'BLC_ACTIVE' ) ) {
	trigger_error(
		'Another version of Broken Link Checker is already active. Please deactivate it before activating this one.',
		E_USER_ERROR
	);
} else {

define( 'BLC_ACTIVE', true );

// Fail fast if the WP version is unsupported. The $wp_version variable may be obfuscated by other
	// plugins, so use function detection to determine the version. get_post_stati was introduced in WP 3.0.0
	if ( ! function_exists( 'get_post_stati' ) ) {
		trigger_error(
			'This version of Broken Link Checker requires WordPress 3.0 or later!',
			E_USER_ERROR
		);
	}

/***********************************************
					Debugging stuff
	*/
	// define('BLC_DEBUG', true);

/***********************************************
					Constants
	*/

/**
	* For performance, some internal APIs used for retrieving multiple links, instances or containers
	* can take an optional "$purpose" argument. Those APIs will try to use this argument to pre-load
	* any DB data required for the specified purpose ahead of time.

* For example, if you're loading a bunch of link containers for the purposes of parsing them and
	* thus set $purpose to BLC_FOR_PARSING, the relevant container managers will (if applicable) precache
	* the parse-able fields in each returned container object. Still, setting $purpose to any particular
	* value does not *guarantee* any data will be preloaded - it's only a suggestion that it should.

* The currently supported values for the $purpose argument are :
	*/
	define( 'BLC_FOR_EDITING', 'edit' );
	define( 'BLC_FOR_PARSING', 'parse' );
	define( 'BLC_FOR_DISPLAY', 'display' );
	define( 'BLC_DATABASE_VERSION', 18 );

/***********************************************
					Configuration
	*/
	// Create and register configuration managers.
	require BLC_DIRECTORY_LEGACY . '/config.php';

/***********************************************
					Logging
	*/

blc_init_configuration();
	$blc_config_manager = blc_get_configuration();

include BLC_DIRECTORY_LEGACY . '/includes/logger.php';

global $blclog;
	if ( $blc_config_manager->get( 'logging_enabled', false ) && is_writable( $blc_config_manager->get( 'log_file' ) ) ) {
		$blclog = new blcFileLogger( $blc_config_manager->get( 'log_file' ) );
	} else {
		$blclog = new blcDummyLogger();
	}

/*
	if ( defined('BLC_DEBUG') && constant('BLC_DEBUG') ){
		//Load FirePHP for debug logging
		if ( !class_exists('FB') && file_exists(BLC_DIRECTORY_LEGACY . '/FirePHPCore/fb.php4') ) {
			require_once BLC_DIRECTORY_LEGACY . '/FirePHPCore/fb.php4';
		}
		//FB::setEnabled(false);
	}
	//to comment out all calls : (^[^\/]*)(FB::)  ->  $1\/\/$2
	//to uncomment : \/\/(\s*FB::)  ->   $1
	//*/

/***********************************************
					Global functions
	 ************************************************/

/**
	 * Notify the link checker that there are unsynched items
	 * that might contain links (e.g. a new or edited post).
	 *
	 * @return void
	 */
	function blc_got_unsynched_items() {
		$conf = blc_get_configuration();

if ( ! $conf->options['need_resynch'] ) {
			$conf->options['need_resynch'] = true;
			$conf->save_options();
		}
	}

/**
	 * (Re)create synchronization records for all containers and mark them all as unparsed.
	 *
	 * @param bool $forced If true, the plugin will recreate all synch. records from scratch.
	 * @return void
	 */
	function blc_resynch( $forced = false ) {
		global $wpdb, $blclog;

if ( $forced ) {
			$blclog->info( '... Forced resynchronization initiated' );

// Drop all synchronization records
			$wpdb->query( "TRUNCATE {$wpdb->prefix}blc_synch" );
		} else {
			$blclog->info( '... Resynchronization initiated' );
		}

// Remove invalid DB entries
		blc_cleanup_database();

// (Re)create and update synch. records for all container types.
		$blclog->info( '... (Re)creating container records' );
		blcContainerHelper::resynch( $forced );

$blclog->info( '... Setting resync. flags' );
		blc_got_unsynched_items();

// All done.
		$blclog->info( 'Database resynchronization complete.' );
	}

/**
	 * Delete synch. records, instances and links that refer to missing or invalid items.
	 *
	 * @return void
	 */
	function blc_cleanup_database() {
		global $blclog;

// Delete synch. records for container types that don't exist
		$blclog->info( '... Deleting invalid container records' );
		blcContainerHelper::cleanup_containers();

// Delete invalid instances
		$blclog->info( '... Deleting invalid link instances' );
		blc_cleanup_instances();

// Delete orphaned links
		$blclog->info( '... Deleting orphaned links' );
		blc_cleanup_links();
	}

/***********************************************
					Utility hooks
	 ************************************************/

/**
	 * Adds the following cron schedules:
	 * - 10min: every 10 minutes.
	 * - weekly: once per week.
	 * - bimonthly : twice per month.
	 *
	 * @param array $schedules Existing Cron schedules.
	 * @return array
	 */
	function blc_cron_schedules( $schedules ) {

if ( ! isset( $schedules['10min'] ) ) {
			$schedules['10min'] = array(
				'interval' => 600,
				'display'  => __( 'Every 10 minutes' ),
			);
		}

if ( ! isset( $schedules['weekly'] ) ) {
			$schedules['weekly'] = array(
				'interval' => 604800, // 7 days
				'display'  => __( 'Once Weekly' ),
			);
		}
		if ( ! isset( $schedules['bimonthly'] ) ) {
			$schedules['bimonthly'] = array(
				'interval' => 15 * 24 * 2600, // 15 days
				'display'  => __( 'Twice a Month' ),
			);
		}

return $schedules;
	}
	add_filter( 'cron_schedules', 'blc_cron_schedules' );

/***********************************************
					Main functionality
	*/

require BLC_DIRECTORY_LEGACY . '/includes/activation.php';

// Load the plugin if installed successfully
	if ( $blc_config_manager->options['installation_complete'] ) {
		function blc_init() {
			global $blc_module_manager, $ws_link_checker;
			$blc_config_manager = blc_get_configuration();

static $init_done = false;
			if ( $init_done ) {
				return;
			}
			$init_done = true;

// Ensure the database is up to date
			if ( BLC_DATABASE_VERSION !== $blc_config_manager->options['current_db_version'] ) {
				require_once BLC_DIRECTORY_LEGACY . '/includes/admin/db-upgrade.php';

// Throttle upgrade attempts (on both single-site and multisite) so that a burst of
				// concurrent requests can't all try to run the schema diff/ALTER queries at once.
				// Without this, every request that sees a stale current_db_version re-runs the
				// upgrade, and concurrent identical ALTER TABLE statements pile up waiting on the
				// same metadata lock.
				$last_upgrade_time = intval( get_site_option( 'wpmudev_blc_last_db_upgrade', 0 ) );
				$last_upgrade_diff = time() - $last_upgrade_time;

if ( apply_filters( 'wpmudev_blc_db_upgrade_cooldown_sec', 30 ) <= $last_upgrade_diff ) {
					update_site_option( 'wpmudev_blc_last_db_upgrade', time() );

// Also updates the DB ver. in options['current_db_version'].
					blcDatabaseUpgrader::upgrade_database();
				}
			}

// Load the base classes and utilities
			require_once BLC_DIRECTORY_LEGACY . '/includes/links.php';
			require_once BLC_DIRECTORY_LEGACY . '/includes/link-query.php';
			require_once BLC_DIRECTORY_LEGACY . '/includes/instances.php';
			require_once BLC_DIRECTORY_LEGACY . '/includes/utility-class.php';

// Load the module subsystem
			require_once BLC_DIRECTORY_LEGACY . '/includes/modules.php';

// Load the modules that want to be executed in all contexts
			if ( is_object( $blc_module_manager ) && method_exists( $blc_module_manager, 'load_modules' ) ) {
				$blc_module_manager->load_modules();
			}

if ( is_admin() || defined( 'DOING_CRON' ) ) {

// It's an admin-side or Cron request. Load the core.
				require_once BLC_DIRECTORY_LEGACY . '/core/core.php';
				$ws_link_checker = new wsBrokenLinkChecker( BLC_PLUGIN_FILE_LEGACY, $blc_config_manager );

} else {

// This is user-side request, so we don't need to load the core.
				// We might need to inject the CSS for removed links, though.
				if ( $blc_config_manager->options['mark_removed_links'] && ! empty( $blc_config_manager->options['removed_link_css'] ) ) {
					function blc_print_removed_link_css() {
						$blc_config_manager = blc_get_configuration();
						echo '<style>',$blc_config_manager->options['removed_link_css'],'</style>';
					}
					add_action( 'wp_head', 'blc_print_removed_link_css' );
				}
			}
		}
		add_action( 'init', 'blc_init', 2000 );
	} else {
		// Display installation errors (if any) on the Dashboard.
		function blc_print_installation_errors() {
			global $wpdb;
			$blc_config_manager = blc_get_configuration();

if ( $blc_config_manager->options['installation_complete'] ) {
				return;
			}

$messages = array(
				'<strong>' . __( 'Broken Link Checker installation failed. Try deactivating and then reactivating the plugin.', 'broken-link-checker' ) . '</strong>',
			);

$missing_options = $blc_config_manager->get_missing_options();
			if ( empty( $missing_options ) ) {
				$logger   = new blcCachedOptionLogger( 'blc_installation_log' );
				$messages = array_merge(
					$messages,
					array(
						'installation_complete = ' . ( isset( $blc_config_manager->options['installation_complete'] ) ? intval( $blc_config_manager->options['installation_complete'] ) : 'no value' ),
						'installation_flag_cleared_on = ' . $blc_config_manager->options['installation_flag_cleared_on'],
						'installation_flag_set_on = ' . $blc_config_manager->options['installation_flag_set_on'],
						'',
						'<em>Installation log follows :</em>',
					),
					$logger->get_messages()
				);
			} else {
				foreach ( $missing_options as $option_name ) {
					$messages[] = sprintf(
						'<strong>Failed to load plugin settings from the "%s" option.</strong>',
						$option_name
					);
					$messages[] = '';

$serialized_config = $wpdb->get_var(
						$wpdb->prepare(
							"SELECT `option_value` FROM `$wpdb->options` WHERE `option_name` = %s",
							$option_name
						)
					);

if ( null === $serialized_config ) {
						$messages[] = "Option doesn't exist in the {$wpdb->options} table.";
					} else {
						$messages[] = "Option exists in the {$wpdb->options} table and has the following value:";
						$messages[] = '';
						$messages[] = '<textarea cols="120" rows="20">' . htmlentities( $serialized_config ) . '</textarea>';
					}
				}
			}

echo '<div class="error"><p>', implode( "<br>\n", $messages ), '</p></div>';
		}
		add_action( 'admin_notices', 'blc_print_installation_errors' );
	}
}

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