JezK
Edit File: page-speed-boost.php
<?php declare(strict_types=1); namespace wpengine\cache_plugin; \wpengine\cache_plugin\check_security(); class PageSpeedBoost { private static $instance = null; public function purge_cache() { if ( $this->is_page_speed_boost_installed() ) { if ( function_exists( 'nitropack_sdk_invalidate' ) ) { return nitropack_sdk_invalidate( null, null, 'Manual invalidation of all pages by PSB' ); } } return false; } public function is_page_speed_boost_installed() { if ( ! $this->file_exists( WP_PLUGIN_DIR . '/nitropack' ) ) { return false; } if ( ! $this->function_exists( 'get_nitropack' ) ) { return false; } $nitropack = $this->get_nitropack(); if ( ! method_exists( $nitropack, 'getDistribution' ) ) { return false; } return 'oneclick' === $nitropack->getDistribution(); } public static function get_instance() { if ( null === self::$instance ) { self::$instance = new PageSpeedBoost(); } return self::$instance; } public function file_exists( $file ) { return file_exists( $file ); } public function function_exists( $file ) { return function_exists( $file ); } public function get_nitropack() { return get_nitropack(); } }