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Edit File: autoptimizeCacheChecker.php

<?php
/**
 * CacheChecker - new in AO 2.0
 *
 * Daily cronned job (filter to change freq. + filter to disable).
 * Checks if cachesize is > 0.5GB (size is filterable), if so, an option is set which controls showing an admin notice.
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

class autoptimizeCacheChecker
{
    const SCHEDULE_HOOK = 'ao_cachechecker';

public function __construct()
    {
    }

public function run()
    {
        $this->add_hooks();
    }

public function add_hooks()
    {
        if ( is_admin() ) {
            add_action( 'plugins_loaded', array( $this, 'setup' ) );
        }
        add_action( self::SCHEDULE_HOOK, array( $this, 'cronjob' ) );
        add_action( 'admin_notices', array( $this, 'show_admin_notice' ) );
    }

public function setup()
    {
        $do_cache_check = (bool) apply_filters( 'autoptimize_filter_cachecheck_do', true );
        $schedule       = wp_get_schedule( self::SCHEDULE_HOOK );
        $frequency      = apply_filters( 'autoptimize_filter_cachecheck_frequency', 'twicedaily' );
        if ( ! in_array( $frequency, array( 'hourly', 'twicedaily', 'daily', 'weekly', 'monthly' ) ) ) {
            $frequency = 'twicedaily';
        }
        if ( $do_cache_check && ( ! $schedule || $schedule !== $frequency ) ) {
            if ( $schedule ) {
                wp_clear_scheduled_hook( self::SCHEDULE_HOOK );
            }
            wp_schedule_event( time(), $frequency, self::SCHEDULE_HOOK );
        } elseif ( $schedule && ! $do_cache_check ) {
            wp_clear_scheduled_hook( self::SCHEDULE_HOOK );
        }
    }

public function cronjob()
    {
        // Check cachesize and act accordingly.
        $max_size       = (int) apply_filters( 'autoptimize_filter_cachecheck_maxsize', 536870912 );
        $do_cache_check = (bool) apply_filters( 'autoptimize_filter_cachecheck_do', true );
        $stat_array     = autoptimizeCache::stats();
        $cache_size     = round( $stat_array[1] );
        if ( ( $cache_size > $max_size ) && ( $do_cache_check ) ) {
            autoptimizeOptionWrapper::update_option( 'autoptimize_cachesize_notice', true );
            if ( apply_filters( 'autoptimize_filter_cachecheck_sendmail', true ) ) {
                $home_url  = esc_url( home_url() );
                $ao_mailto = apply_filters( 'autoptimize_filter_cachecheck_mailto', autoptimizeOptionWrapper::get_option( 'admin_email', '' ) );

$ao_mailsubject = __( 'Autoptimize cache size warning', 'autoptimize' ) . ' (' . $home_url . ')';
                $ao_mailbody    = __( 'Autoptimize\'s cache size is getting big, consider purging the cache. Have a look at https://wordpress.org/plugins/autoptimize/faq/ to see how you can keep the cache size under control.', 'autoptimize' ) . ' (site: ' . $home_url . ')';

if ( ! empty( $ao_mailto ) ) {
                    $ao_mailresult = wp_mail( $ao_mailto, $ao_mailsubject, $ao_mailbody );
                    if ( ! $ao_mailresult ) {
                        error_log( 'Autoptimize could not send cache size warning mail.' );
                    }
                }
            }
        }

// Check if 3rd party services (e.g. image proxy) are up.
        autoptimizeUtils::check_service_availability();

// Nukes advanced cache clearing artifacts if they exists...
        autoptimizeCache::delete_advanced_cache_clear_artifacts();

// Check image optimization stats.
        autoptimizeImages::instance()->query_img_provider_stats();
    }

public function show_admin_notice()
    {
        if ( (bool) autoptimizeOptionWrapper::get_option( 'autoptimize_cachesize_notice', false ) && current_user_can( 'manage_options' ) ) {
            echo '<div class="notice notice-warning"><p>';
            _e( '<strong>Autoptimize\'s cache size is getting big</strong>, consider purging the cache. Have a look at <a href="https://wordpress.org/plugins/autoptimize/faq/" target="_blank" rel="noopener noreferrer">the Autoptimize FAQ</a> to see how you can keep the cache size under control.', 'autoptimize' );
            echo '</p></div>';
            autoptimizeOptionWrapper::update_option( 'autoptimize_cachesize_notice', false );
        }

// Notice for image proxy usage.
        $_imgopt_notice = autoptimizeImages::instance()->get_imgopt_status_notice_wrapper();
        if ( current_user_can( 'manage_options' ) && is_array( $_imgopt_notice ) && array_key_exists( 'status', $_imgopt_notice ) && in_array( $_imgopt_notice['status'], array( 1, -1, -2, -3 ) ) ) {
            $_dismissible = 'ao-img-opt-notice-';
            $_hide_notice = '7';

if ( -1 == $_imgopt_notice['status'] || -2 == $_imgopt_notice['status'] || -3 == $_imgopt_notice['status'] ) {
                $_hide_notice = '1';
            }

$_imgopt_notice_dismissible = apply_filters( 'autoptimize_filter_imgopt_notice_dismissable', $_dismissible . $_hide_notice );

if ( $_imgopt_notice && PAnD::is_admin_notice_active( $_imgopt_notice_dismissible ) ) {
                echo '<div class="notice notice-warning is-dismissible" data-dismissible="' . $_imgopt_notice_dismissible . '"><p><strong>' . __( 'Autoptimize', 'autoptimize' ) . '</strong>: ' . $_imgopt_notice['notice'] . '</p></div>';
            }
        }
    }
}

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