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Dir : /home/trave494/live2news.com/wp-content/plugins/w3-total-cache/DbCache_Wpdb.php

<?php
namespace W3TC;

/**
 * class Db
 * Database access mediator
 */
class DbCache_Wpdb extends DbCache_WpdbBase {
	/**
	 * Returns object instance. Called by WP engine
	 *
	 * @return DbCache_Wpdb
	 */
	static function instance() {
		static $instance = null;

		if ( is_null( $instance ) ) {
			$processors = array();
			$call_default_constructor = true;

			// no caching during activation
			$is_installing = ( defined( 'WP_INSTALLING' ) && WP_INSTALLING );

			$config = Dispatcher::config();
			if ( !$is_installing && $config->get_boolean( 'dbcache.enabled' ) ) {
				$processors[] = new DbCache_WpdbInjection_QueryCaching();
			}
			if ( Util_Environment::is_dbcluster( $config ) ) {
				// dbcluster use mysqli only since other is obsolete now
				if ( !defined( 'WP_USE_EXT_MYSQL' ) ) {
					define( 'WP_USE_EXT_MYSQL', false );
				}

				$processors[] = new Enterprise_Dbcache_WpdbInjection_Cluster();
			}

			$processors[] = new DbCache_WpdbInjection();

			global $wp_version;
			if (version_compare( $wp_version, '5.3') >= 0) {
				$o = new DbCache_WpdbNew( $processors );
			} else {
				$o = new DbCache_WpdbLegacy( $processors );
			}

			$next_injection = new _CallUnderlying( $o );

			foreach ( $processors as $processor ) {
				$processor->initialize_injection( $o, $next_injection );
			}

			// initialize after processors configured
			$o->initialize();

			$instance = $o;
		}

		return $instance;
	}
}