<?php
/**
* Built-in Cache System
*
* Ultra-fast page caching system built into the theme
* No plugins needed - WP Rocket alternative
*
* @package MyTheme
*/
// Exit if accessed directly
if (!defined('ABSPATH')) {
exit;
}
class MyTheme_Cache_System {
private $cache_dir;
private $cache_enabled;
private $cache_duration;
/**
* Constructor
*/
public function __construct() {
// Cache settings
$this->cache_enabled = function_exists('mytheme_get_option') ? mytheme_get_option('cache_enabled', true) : true;
$this->cache_duration = function_exists('mytheme_get_option') ? mytheme_get_option('cache_duration', 3600) : 3600;
// Cache directory
$upload_dir = wp_upload_dir();
$this->cache_dir = $upload_dir['basedir'] . '/mytheme-cache';
// Initialize
$this->init();
}
/**
* Initialize cache system
*/
private function init() {
if (!$this->cache_enabled) {
return;
}
// Create cache directory
$this->create_cache_dir();
// Start output buffering for page caching
add_action('template_redirect', array($this, 'start_page_cache'), 1);
// Clear cache actions
add_action('save_post', array($this, 'clear_post_cache'));
add_action('comment_post', array($this, 'clear_post_cache'));
add_action('switch_theme', array($this, 'clear_all_cache'));
add_action('mytheme_clear_cache', array($this, 'clear_all_cache'));
// Admin bar cache clear button
add_action('admin_bar_menu', array($this, 'add_cache_clear_button'), 999);
add_action('admin_post_mytheme_clear_cache', array($this, 'handle_cache_clear'));
// AJAX cache clear
add_action('wp_ajax_mytheme_clear_cache', array($this, 'ajax_clear_cache'));
}
/**
* Create cache directory
*/
private function create_cache_dir() {
if (!file_exists($this->cache_dir)) {
wp_mkdir_p($this->cache_dir);
// Add .htaccess for security
$htaccess = $this->cache_dir . '/.htaccess';
if (!file_exists($htaccess)) {
file_put_contents($htaccess, 'deny from all');
}
}
}
/**
* Get cache file path
*/
private function get_cache_file_path($url = null) {
if ($url === null) {
$url = $_SERVER['REQUEST_URI'];
}
// Generate unique cache key
$cache_key = md5($url . (is_user_logged_in() ? 'logged_in' : 'guest'));
return $this->cache_dir . '/' . $cache_key . '.html';
}
/**
* Start page caching
*/
public function start_page_cache() {
// Don't cache for logged-in users or admin
if (is_user_logged_in() || is_admin()) {
return;
}
// Don't cache POST requests
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
return;
}
// Don't cache search, 404, feeds
if (is_search() || is_404() || is_feed() || is_trackback()) {
return;
}
// Check if cached version exists
$cache_file = $this->get_cache_file_path();
if (file_exists($cache_file)) {
$cache_age = time() - filemtime($cache_file);
// Serve cached version if not expired
if ($cache_age < $this->cache_duration) {
header('X-MyTheme-Cache: HIT');
header('Cache-Control: max-age=' . $this->cache_duration);
readfile($cache_file);
exit;
} else {
// Delete expired cache
unlink($cache_file);
}
}
// Start output buffering to create cache
header('X-MyTheme-Cache: MISS');
ob_start(array($this, 'save_page_cache'));
}
/**
* Save page to cache
*/
public function save_page_cache($html) {
// Don't cache if HTML is empty or too small
if (strlen($html) < 255) {
return $html;
}
// Save to cache file
$cache_file = $this->get_cache_file_path();
file_put_contents($cache_file, $html);
return $html;
}
/**
* Clear post cache
*/
public function clear_post_cache($post_id) {
$post_url = get_permalink($post_id);
$cache_file = $this->get_cache_file_path($post_url);
if (file_exists($cache_file)) {
unlink($cache_file);
}
// Also clear homepage and category archives
$this->clear_homepage_cache();
}
/**
* Clear homepage cache
*/
private function clear_homepage_cache() {
$home_cache = $this->get_cache_file_path('/');
if (file_exists($home_cache)) {
unlink($home_cache);
}
}
/**
* Clear all cache
*/
public function clear_all_cache() {
if (!file_exists($this->cache_dir)) {
return;
}
// Delete all cache files
$files = glob($this->cache_dir . '/*.html');
foreach ($files as $file) {
if (is_file($file)) {
unlink($file);
}
}
}
/**
* Add cache clear button to admin bar
*/
public function add_cache_clear_button($wp_admin_bar) {
if (!current_user_can('manage_options')) {
return;
}
$wp_admin_bar->add_node(array(
'id' => 'mytheme-clear-cache',
'title' => 'Clear Cache',
'href' => wp_nonce_url(admin_url('admin-post.php?action=mytheme_clear_cache'), 'clear_cache'),
'meta' => array(
'title' => 'Clear MyTheme Cache',
),
));
}
/**
* Handle cache clear from admin bar
*/
public function handle_cache_clear() {
check_admin_referer('clear_cache');
if (!current_user_can('manage_options')) {
wp_die('Unauthorized');
}
$this->clear_all_cache();
wp_redirect(wp_get_referer());
exit;
}
/**
* AJAX clear cache
*/
public function ajax_clear_cache() {
check_ajax_referer('mytheme-nonce', 'nonce');
if (!current_user_can('manage_options')) {
wp_send_json_error('Unauthorized');
}
$this->clear_all_cache();
wp_send_json_success('Cache cleared successfully');
}
/**
* Get cache statistics
*/
public function get_cache_stats() {
if (!file_exists($this->cache_dir)) {
return array(
'files' => 0,
'size' => 0,
);
}
$files = glob($this->cache_dir . '/*.html');
$total_size = 0;
foreach ($files as $file) {
$total_size += filesize($file);
}
return array(
'files' => count($files),
'size' => size_format($total_size),
'size_bytes' => $total_size,
);
}
}
// Initialize cache system
new MyTheme_Cache_System();
/**
* Helper function to clear cache
*/
function mytheme_clear_cache() {
do_action('mytheme_clear_cache');
}
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