From a5fe68e002632c190ffbd85167671ed4d4961135 Mon Sep 17 00:00:00 2001
From: donncha <donncha@7be80a69-a1ef-0310-a953-fb0f7c49ff36>
Date: Thu, 21 Jun 2007 16:41:02 +0000
Subject: WP Merge to WP 2.2.1

git-svn-id: http://svn.automattic.com/wordpress-mu/trunk@1005 7be80a69-a1ef-0310-a953-fb0f7c49ff36
---
 wp-includes/cache.php | 916 +++++++++++++++++++++++++-------------------------
 1 file changed, 458 insertions(+), 458 deletions(-)

(limited to 'wp-includes/cache.php')

diff --git a/wp-includes/cache.php b/wp-includes/cache.php
index 6901a6b..695a986 100644
--- a/wp-includes/cache.php
+++ b/wp-includes/cache.php
@@ -1,458 +1,458 @@
-<?php
-function wp_cache_add($key, $data, $flag = '', $expire = 0) {
-	global $wp_object_cache;
-	$data = unserialize(serialize($data));
-
-	return $wp_object_cache->add($key, $data, $flag, $expire);
-}
-
-function wp_cache_close() {
-	global $wp_object_cache;
-
-	if ( ! isset($wp_object_cache) )
-		return;
-	return $wp_object_cache->save();
-}
-
-function wp_cache_delete($id, $flag = '') {
-	global $wp_object_cache;
-
-	return $wp_object_cache->delete($id, $flag);
-}
-
-function wp_cache_flush() {
-	global $wp_object_cache;
-
-	return $wp_object_cache->flush();
-}
-
-function wp_cache_get($id, $flag = '') {
-	global $wp_object_cache;
-
-	return $wp_object_cache->get($id, $flag);
-}
-
-function wp_cache_init() {
-	$GLOBALS['wp_object_cache'] =& new WP_Object_Cache();
-}
-
-function wp_cache_replace($key, $data, $flag = '', $expire = 0) {
-	global $wp_object_cache;
-	$data = unserialize(serialize($data));
-
-	return $wp_object_cache->replace($key, $data, $flag, $expire);
-}
-
-function wp_cache_set($key, $data, $flag = '', $expire = 0) {
-	global $wp_object_cache;
-	$data = unserialize(serialize($data));
-
-	return $wp_object_cache->set($key, $data, $flag, $expire);
-}
-
-define('CACHE_SERIAL_HEADER', "<?php\n/*");
-define('CACHE_SERIAL_FOOTER', "*/\n?".">");
-
-class WP_Object_Cache {
-	var $cache_dir;
-	var $cache_enabled = false;
-	var $expiration_time = 900;
-	var $flock_filename = 'wp_object_cache.lock';
-	var $mutex;
-	var $cache = array ();
-	var $dirty_objects = array ();
-	var $non_existant_objects = array ();
-	var $global_groups = array ('users', 'userlogins', 'usermeta', 'site-options', 'site-lookup', 'blog-lookup', 'blog-details');
-	var $blog_id;
-	var $cold_cache_hits = 0;
-	var $warm_cache_hits = 0;
-	var $cache_misses = 0;
-	var $secret = '';
-
-	function acquire_lock() {
-		// Acquire a write lock.
-		$this->mutex = @fopen($this->cache_dir.$this->flock_filename, 'w');
-		if ( false == $this->mutex)
-			return false;
-		flock($this->mutex, LOCK_EX);
-		return true;
-	}
-
-	function key($key, $group) {
-		global $blog_id;
-
-		if ( empty($group) )
-			$group = 'default';
-
-		if (false !== array_search($group, $this->global_groups))
-			$prefix = '';
-		else
-			$prefix = $blog_id . '-';
-
-		if( '' != $key )
-			$key = '-' . $key;
-
-		return "$prefix$group$key";
-	}
-
-
-	function add($id, $data, $group = 'default', $expire = '') {
-		if (empty ($group))
-			$group = 'default';
-
-		if (false !== $this->get($id, $group, false))
-			return false;
-
-		return $this->set($id, $data, $group, $expire);
-	}
-
-	function delete($id, $group = 'default', $force = false) {
-		$hash = $this->key($id, $group);
-		if (empty ($group))
-			$group = 'default';
-
-		if (!$force && false === $this->get($id, $group, false))
-			return false;
-
-		unset ($this->cache[$hash]);
-		$this->non_existant_objects[$hash] = true;
-		$this->dirty_objects[$this->key( '', $group )][] = $id;
-		return true;
-	}
-
-	function flush() {
-		if ( !$this->cache_enabled )
-			return true;
-
-		if ( ! $this->acquire_lock() )
-			return false;
-
-		$this->rm_cache_dir();
-		$this->cache = array ();
-		$this->dirty_objects = array ();
-		$this->non_existant_objects = array ();
-
-		$this->release_lock();
-
-		return true;
-	}
-
-	function get($id, $group = 'default', $count_hits = true) {
-		$hash = $this->key($id, $group);
-		$group_key = $this->key( '', $group );
-		if (empty ($group))
-			$group = 'default';
-
-		if (isset ($this->cache[$hash])) {
-			if ($count_hits)
-				$this->warm_cache_hits += 1;
-			return $this->cache[$hash];
-		}
-
-		if (isset ($this->non_existant_objects[$hash]))
-			return false;
-
-		//  If caching is not enabled, we have to fall back to pulling from the DB.
-		if (!$this->cache_enabled) {
-			if (!isset ($this->cache[$group_key]))
-				$this->load_group_from_db($group_key);
-
-			if (isset ($this->cache[$hash])) {
-				$this->cold_cache_hits += 1;
-				return $this->cache[$hash];
-			}
-
-			$this->non_existant_objects[$hash] = true;
-			$this->cache_misses += 1;
-			return false;
-		}
-
-		$cache_file = $this->cache_dir.$this->get_group_dir($group_key)."/".$this->hash($hash).'.php';
-		if (!file_exists($cache_file)) {
-			$this->non_existant_objects[$hash] = true;
-			$this->cache_misses += 1;
-			return false;
-		}
-
-		// If the object has expired, remove it from the cache and return false to force
-		// a refresh.
-		$now = time();
-		if ((filemtime($cache_file) + $this->expiration_time) <= $now) {
-			$this->cache_misses += 1;
-			$this->delete($id, $group, true);
-			return false;
-		}
-
-		$this->cache[$hash] = unserialize(base64_decode(substr(@ file_get_contents($cache_file), strlen(CACHE_SERIAL_HEADER), -strlen(CACHE_SERIAL_FOOTER))));
-		if (false === $this->cache[$hash])
-			$this->cache[$hash] = '';
-
-		$this->cold_cache_hits += 1;
-		return $this->cache[$hash];
-	}
-
-	function get_group_dir($group) {
-		if (false !== array_search($group, $this->global_groups))
-			return $group;
-
-		return "{$this->blog_id}/$group";
-	}
-
-	function hash($data) {
-		if ( function_exists('hash_hmac') ) {
-			return hash_hmac('md5', $data, $this->secret);
-		} else {
-			return md5($data . $this->secret);
-		}
-	}
-
-	function load_group_from_db($group) {
-		global $wpdb;
-
-		if ('category' == $group) {
-			$this->cache['category'] = array ();
-			if ($dogs = $wpdb->get_results("SELECT * FROM $wpdb->categories")) {
-				foreach ($dogs as $catt) {
-					$this->cache['category'][$catt->cat_ID] = $catt;
-					$this->cache[$this->key( $catt->cat_ID, 'category' )] = $catt;
-				}
-			}
-		}
-
-	}
-
-	function make_group_dir($group, $perms) {
-		$group_dir = $this->get_group_dir($group);
-		$make_dir = '';
-		foreach (split('/', $group_dir) as $subdir) {
-			$make_dir .= "$subdir/";
-			if (!file_exists($this->cache_dir.$make_dir)) {
-				if (! @ mkdir($this->cache_dir.$make_dir))
-					break;
-				@ chmod($this->cache_dir.$make_dir, $perms);
-			}
-
-			if (!file_exists($this->cache_dir.$make_dir."index.php")) {
-				$file_perms = $perms & 0000666;
-				@ touch($this->cache_dir.$make_dir."index.php");
-				@ chmod($this->cache_dir.$make_dir."index.php", $file_perms);
-			}
-		}
-
-		return $this->cache_dir."$group_dir/";
-	}
-
-	function rm_cache_dir() {
-		$dir = $this->cache_dir;
-		$dir = rtrim($dir, DIRECTORY_SEPARATOR);
-		$top_dir = $dir;
-		$stack = array($dir);
-		$index = 0;
-
-		while ($index < count($stack)) {
-			# Get indexed directory from stack
-			$dir = $stack[$index];
-
-			$dh = @ opendir($dir);
-			if (!$dh)
-				return false;
-
-			while (($file = @ readdir($dh)) !== false) {
-				if ($file == '.' or $file == '..')
-					continue;
-
-				if (@ is_dir($dir . DIRECTORY_SEPARATOR . $file))
-					$stack[] = $dir . DIRECTORY_SEPARATOR . $file;
-				else if (@ is_file($dir . DIRECTORY_SEPARATOR . $file))
-					@ unlink($dir . DIRECTORY_SEPARATOR . $file);
-			}
-
-			$index++;
-		}
-
-		$stack = array_reverse($stack);  // Last added dirs are deepest
-		foreach($stack as $dir) {
-			if ( $dir != $top_dir)
-				@ rmdir($dir);
-		}
-
-	}
-
-	function release_lock() {
-		// Release write lock.
-		flock($this->mutex, LOCK_UN);
-		fclose($this->mutex);
-	}
-
-	function replace($id, $data, $group = 'default', $expire = '') {
-		if (empty ($group))
-			$group = 'default';
-
-		if (false === $this->get($id, $group, false))
-			return false;
-
-		return $this->set($id, $data, $group, $expire);
-	}
-
-	function set($id, $data, $group = 'default', $expire = '') {
-		$hash = $this->key($id, $group);
-		if (empty ($group))
-			$group = 'default';
-
-		if (NULL == $data)
-			$data = '';
-
-		$this->cache[$hash] = $data;
-		unset ($this->non_existant_objects[$hash]);
-		$this->dirty_objects[$this->key( '', $group )][] = $id;
-
-		return true;
-	}
-
-	function save() {
-		//$this->stats();
-
-		if (!$this->cache_enabled)
-			return true;
-
-		if (empty ($this->dirty_objects))
-			return true;
-
-		// Give the new dirs the same perms as wp-content.
-		$stat = stat(ABSPATH.'wp-content');
-		$dir_perms = $stat['mode'] & 0007777; // Get the permission bits.
-		$file_perms = $dir_perms & 0000666; // Remove execute bits for files.
-
-		// Make the base cache dir.
-		if (!file_exists($this->cache_dir)) {
-			if (! @ mkdir($this->cache_dir))
-				return false;
-			@ chmod($this->cache_dir, $dir_perms);
-		}
-
-		if (!file_exists($this->cache_dir."index.php")) {
-			@ touch($this->cache_dir."index.php");
-			@ chmod($this->cache_dir."index.php", $file_perms);
-		}
-
-		if ( ! $this->acquire_lock() )
-			return false;
-
-		// Loop over dirty objects and save them.
-		$errors = 0;
-		foreach ($this->dirty_objects as $group => $ids) {
-			$group_dir = $this->make_group_dir($group, $dir_perms);
-
-			$ids = array_unique($ids);
-			foreach ($ids as $id) {
-				$cache_file = $group_dir.$this->hash($group.'-'.$id).'.php';
-
-				// Remove the cache file if the key is not set.
-				if (!isset ($this->cache[$group.'-'.$id])) {
-					if (file_exists($cache_file))
-						@ unlink($cache_file);
-					continue;
-				}
-
-				$temp_file = tempnam($group_dir, 'tmp');
-				$serial = CACHE_SERIAL_HEADER.base64_encode(serialize($this->cache[$group.'-'.$id])).CACHE_SERIAL_FOOTER;
-				$fd = @fopen($temp_file, 'w');
-				if ( false === $fd ) {
-					$errors++;
-					continue;
-				}
-				fputs($fd, $serial);
-				fclose($fd);
-				if (!@ rename($temp_file, $cache_file)) {
-					if (!@ copy($temp_file, $cache_file))
-						$errors++;
-					@ unlink($temp_file);
-				}
-				@ chmod($cache_file, $file_perms);
-			}
-		}
-
-		$this->dirty_objects = array();
-
-		$this->release_lock();
-
-		if ( $errors )
-			return false;
-
-		return true;
-	}
-
-	function stats() {
-		echo "<p>";
-		echo "<strong>Cold Cache Hits:</strong> {$this->cold_cache_hits}<br/>";
-		echo "<strong>Warm Cache Hits:</strong> {$this->warm_cache_hits}<br/>";
-		echo "<strong>Cache Misses:</strong> {$this->cache_misses}<br/>";
-		echo "</p>";
-
-		foreach ($this->cache as $group => $cache) {
-			echo "<p>";
-			echo "<strong>Group:</strong> $group<br/>";
-			echo "<strong>Cache:</strong>";
-			echo "<pre>";
-			print_r($cache);
-			echo "</pre>";
-			if (isset ($this->dirty_objects[$group])) {
-				echo "<strong>Dirty Objects:</strong>";
-				echo "<pre>";
-				print_r(array_unique($this->dirty_objects[$group]));
-				echo "</pre>";
-				echo "</p>";
-			}
-		}
-	}
-
-	function WP_Object_Cache() {
-		return $this->__construct();
-	}
-
-	function __construct() {
-		global $blog_id;
-
-		register_shutdown_function(array(&$this, "__destruct"));
-
-		if (defined('DISABLE_CACHE'))
-			return;
-
-		if ( ! defined('ENABLE_CACHE') )
-			return;
-
-		// Disable the persistent cache if safe_mode is on.
-		if ( ini_get('safe_mode') && ! defined('ENABLE_CACHE') )
-			return;
-
-		if (defined('CACHE_PATH'))
-			$this->cache_dir = CACHE_PATH;
-		else
-			// Using the correct separator eliminates some cache flush errors on Windows
-			$this->cache_dir = ABSPATH.'wp-content'.DIRECTORY_SEPARATOR.'cache'.DIRECTORY_SEPARATOR;
-
-		if (is_writable($this->cache_dir) && is_dir($this->cache_dir)) {
-				$this->cache_enabled = true;
-		} else {
-			if (is_writable(ABSPATH.'wp-content')) {
-				$this->cache_enabled = true;
-			}
-		}
-
-		if (defined('CACHE_EXPIRATION_TIME'))
-			$this->expiration_time = CACHE_EXPIRATION_TIME;
-
-		if ( defined('WP_SECRET') )
-			$this->secret = WP_SECRET;
-		else
-			$this->secret = DB_PASSWORD . DB_USER . DB_NAME . DB_HOST . ABSPATH;
-
-		$this->blog_id = $this->hash($blog_id);
-	}
-
-	function __destruct() {
-		$this->save();
-		return true;
-	}
-}
-?>
+<?php
+function wp_cache_add($key, $data, $flag = '', $expire = 0) {
+	global $wp_object_cache;
+	$data = unserialize(serialize($data));
+
+	return $wp_object_cache->add($key, $data, $flag, $expire);
+}
+
+function wp_cache_close() {
+	global $wp_object_cache;
+
+	if ( ! isset($wp_object_cache) )
+		return;
+	return $wp_object_cache->save();
+}
+
+function wp_cache_delete($id, $flag = '') {
+	global $wp_object_cache;
+
+	return $wp_object_cache->delete($id, $flag);
+}
+
+function wp_cache_flush() {
+	global $wp_object_cache;
+
+	return $wp_object_cache->flush();
+}
+
+function wp_cache_get($id, $flag = '') {
+	global $wp_object_cache;
+
+	return $wp_object_cache->get($id, $flag);
+}
+
+function wp_cache_init() {
+	$GLOBALS['wp_object_cache'] =& new WP_Object_Cache();
+}
+
+function wp_cache_replace($key, $data, $flag = '', $expire = 0) {
+	global $wp_object_cache;
+	$data = unserialize(serialize($data));
+
+	return $wp_object_cache->replace($key, $data, $flag, $expire);
+}
+
+function wp_cache_set($key, $data, $flag = '', $expire = 0) {
+	global $wp_object_cache;
+	$data = unserialize(serialize($data));
+
+	return $wp_object_cache->set($key, $data, $flag, $expire);
+}
+
+define('CACHE_SERIAL_HEADER', "<?php\n/*");
+define('CACHE_SERIAL_FOOTER', "*/\n?".">");
+
+class WP_Object_Cache {
+	var $cache_dir;
+	var $cache_enabled = false;
+	var $expiration_time = 900;
+	var $flock_filename = 'wp_object_cache.lock';
+	var $mutex;
+	var $cache = array ();
+	var $dirty_objects = array ();
+	var $non_existant_objects = array ();
+	var $global_groups = array ('users', 'userlogins', 'usermeta', 'site-options', 'site-lookup', 'blog-lookup', 'blog-details');
+	var $blog_id;
+	var $cold_cache_hits = 0;
+	var $warm_cache_hits = 0;
+	var $cache_misses = 0;
+	var $secret = '';
+
+	function acquire_lock() {
+		// Acquire a write lock.
+		$this->mutex = @fopen($this->cache_dir.$this->flock_filename, 'w');
+		if ( false == $this->mutex)
+			return false;
+		flock($this->mutex, LOCK_EX);
+		return true;
+	}
+
+	function key($key, $group) {
+		global $blog_id;
+
+		if ( empty($group) )
+			$group = 'default';
+
+		if (false !== array_search($group, $this->global_groups))
+			$prefix = '';
+		else
+			$prefix = $blog_id . '-';
+
+		if( '' != $key )
+			$key = '-' . $key;
+
+		return "$prefix$group$key";
+	}
+
+
+	function add($id, $data, $group = 'default', $expire = '') {
+		if (empty ($group))
+			$group = 'default';
+
+		if (false !== $this->get($id, $group, false))
+			return false;
+
+		return $this->set($id, $data, $group, $expire);
+	}
+
+	function delete($id, $group = 'default', $force = false) {
+		$hash = $this->key($id, $group);
+		if (empty ($group))
+			$group = 'default';
+
+		if (!$force && false === $this->get($id, $group, false))
+			return false;
+
+		unset ($this->cache[$hash]);
+		$this->non_existant_objects[$hash] = true;
+		$this->dirty_objects[$this->key( '', $group )][] = $id;
+		return true;
+	}
+
+	function flush() {
+		if ( !$this->cache_enabled )
+			return true;
+
+		if ( ! $this->acquire_lock() )
+			return false;
+
+		$this->rm_cache_dir();
+		$this->cache = array ();
+		$this->dirty_objects = array ();
+		$this->non_existant_objects = array ();
+
+		$this->release_lock();
+
+		return true;
+	}
+
+	function get($id, $group = 'default', $count_hits = true) {
+		$hash = $this->key($id, $group);
+		$group_key = $this->key( '', $group );
+		if (empty ($group))
+			$group = 'default';
+
+		if (isset ($this->cache[$hash])) {
+			if ($count_hits)
+				$this->warm_cache_hits += 1;
+			return $this->cache[$hash];
+		}
+
+		if (isset ($this->non_existant_objects[$hash]))
+			return false;
+
+		//  If caching is not enabled, we have to fall back to pulling from the DB.
+		if (!$this->cache_enabled) {
+			if (!isset ($this->cache[$group_key]))
+				$this->load_group_from_db($group_key);
+
+			if (isset ($this->cache[$hash])) {
+				$this->cold_cache_hits += 1;
+				return $this->cache[$hash];
+			}
+
+			$this->non_existant_objects[$hash] = true;
+			$this->cache_misses += 1;
+			return false;
+		}
+
+		$cache_file = $this->cache_dir.$this->get_group_dir($group_key)."/".$this->hash($hash).'.php';
+		if (!file_exists($cache_file)) {
+			$this->non_existant_objects[$hash] = true;
+			$this->cache_misses += 1;
+			return false;
+		}
+
+		// If the object has expired, remove it from the cache and return false to force
+		// a refresh.
+		$now = time();
+		if ((filemtime($cache_file) + $this->expiration_time) <= $now) {
+			$this->cache_misses += 1;
+			$this->delete($id, $group, true);
+			return false;
+		}
+
+		$this->cache[$hash] = unserialize(base64_decode(substr(@ file_get_contents($cache_file), strlen(CACHE_SERIAL_HEADER), -strlen(CACHE_SERIAL_FOOTER))));
+		if (false === $this->cache[$hash])
+			$this->cache[$hash] = '';
+
+		$this->cold_cache_hits += 1;
+		return $this->cache[$hash];
+	}
+
+	function get_group_dir($group) {
+		if (false !== array_search($group, $this->global_groups))
+			return $group;
+
+		return "{$this->blog_id}/$group";
+	}
+
+	function hash($data) {
+		if ( function_exists('hash_hmac') ) {
+			return hash_hmac('md5', $data, $this->secret);
+		} else {
+			return md5($data . $this->secret);
+		}
+	}
+
+	function load_group_from_db($group) {
+		global $wpdb;
+
+		if ('category' == $group) {
+			$this->cache['category'] = array ();
+			if ($dogs = $wpdb->get_results("SELECT * FROM $wpdb->categories")) {
+				foreach ($dogs as $catt) {
+					$this->cache['category'][$catt->cat_ID] = $catt;
+					$this->cache[$this->key( $catt->cat_ID, 'category' )] = $catt;
+				}
+			}
+		}
+
+	}
+
+	function make_group_dir($group, $perms) {
+		$group_dir = $this->get_group_dir($group);
+		$make_dir = '';
+		foreach (split('/', $group_dir) as $subdir) {
+			$make_dir .= "$subdir/";
+			if (!file_exists($this->cache_dir.$make_dir)) {
+				if (! @ mkdir($this->cache_dir.$make_dir))
+					break;
+				@ chmod($this->cache_dir.$make_dir, $perms);
+			}
+
+			if (!file_exists($this->cache_dir.$make_dir."index.php")) {
+				$file_perms = $perms & 0000666;
+				@ touch($this->cache_dir.$make_dir."index.php");
+				@ chmod($this->cache_dir.$make_dir."index.php", $file_perms);
+			}
+		}
+
+		return $this->cache_dir."$group_dir/";
+	}
+
+	function rm_cache_dir() {
+		$dir = $this->cache_dir;
+		$dir = rtrim($dir, DIRECTORY_SEPARATOR);
+		$top_dir = $dir;
+		$stack = array($dir);
+		$index = 0;
+
+		while ($index < count($stack)) {
+			# Get indexed directory from stack
+			$dir = $stack[$index];
+
+			$dh = @ opendir($dir);
+			if (!$dh)
+				return false;
+
+			while (($file = @ readdir($dh)) !== false) {
+				if ($file == '.' or $file == '..')
+					continue;
+
+				if (@ is_dir($dir . DIRECTORY_SEPARATOR . $file))
+					$stack[] = $dir . DIRECTORY_SEPARATOR . $file;
+				else if (@ is_file($dir . DIRECTORY_SEPARATOR . $file))
+					@ unlink($dir . DIRECTORY_SEPARATOR . $file);
+			}
+
+			$index++;
+		}
+
+		$stack = array_reverse($stack);  // Last added dirs are deepest
+		foreach($stack as $dir) {
+			if ( $dir != $top_dir)
+				@ rmdir($dir);
+		}
+
+	}
+
+	function release_lock() {
+		// Release write lock.
+		flock($this->mutex, LOCK_UN);
+		fclose($this->mutex);
+	}
+
+	function replace($id, $data, $group = 'default', $expire = '') {
+		if (empty ($group))
+			$group = 'default';
+
+		if (false === $this->get($id, $group, false))
+			return false;
+
+		return $this->set($id, $data, $group, $expire);
+	}
+
+	function set($id, $data, $group = 'default', $expire = '') {
+		$hash = $this->key($id, $group);
+		if (empty ($group))
+			$group = 'default';
+
+		if (NULL == $data)
+			$data = '';
+
+		$this->cache[$hash] = $data;
+		unset ($this->non_existant_objects[$hash]);
+		$this->dirty_objects[$this->key( '', $group )][] = $id;
+
+		return true;
+	}
+
+	function save() {
+		//$this->stats();
+
+		if (!$this->cache_enabled)
+			return true;
+
+		if (empty ($this->dirty_objects))
+			return true;
+
+		// Give the new dirs the same perms as wp-content.
+		$stat = stat(ABSPATH.'wp-content');
+		$dir_perms = $stat['mode'] & 0007777; // Get the permission bits.
+		$file_perms = $dir_perms & 0000666; // Remove execute bits for files.
+
+		// Make the base cache dir.
+		if (!file_exists($this->cache_dir)) {
+			if (! @ mkdir($this->cache_dir))
+				return false;
+			@ chmod($this->cache_dir, $dir_perms);
+		}
+
+		if (!file_exists($this->cache_dir."index.php")) {
+			@ touch($this->cache_dir."index.php");
+			@ chmod($this->cache_dir."index.php", $file_perms);
+		}
+
+		if ( ! $this->acquire_lock() )
+			return false;
+
+		// Loop over dirty objects and save them.
+		$errors = 0;
+		foreach ($this->dirty_objects as $group => $ids) {
+			$group_dir = $this->make_group_dir($group, $dir_perms);
+
+			$ids = array_unique($ids);
+			foreach ($ids as $id) {
+				$cache_file = $group_dir.$this->hash($group.'-'.$id).'.php';
+
+				// Remove the cache file if the key is not set.
+				if (!isset ($this->cache[$group.'-'.$id])) {
+					if (file_exists($cache_file))
+						@ unlink($cache_file);
+					continue;
+				}
+
+				$temp_file = tempnam($group_dir, 'tmp');
+				$serial = CACHE_SERIAL_HEADER.base64_encode(serialize($this->cache[$group.'-'.$id])).CACHE_SERIAL_FOOTER;
+				$fd = @fopen($temp_file, 'w');
+				if ( false === $fd ) {
+					$errors++;
+					continue;
+				}
+				fputs($fd, $serial);
+				fclose($fd);
+				if (!@ rename($temp_file, $cache_file)) {
+					if (!@ copy($temp_file, $cache_file))
+						$errors++;
+					@ unlink($temp_file);
+				}
+				@ chmod($cache_file, $file_perms);
+			}
+		}
+
+		$this->dirty_objects = array();
+
+		$this->release_lock();
+
+		if ( $errors )
+			return false;
+
+		return true;
+	}
+
+	function stats() {
+		echo "<p>";
+		echo "<strong>Cold Cache Hits:</strong> {$this->cold_cache_hits}<br/>";
+		echo "<strong>Warm Cache Hits:</strong> {$this->warm_cache_hits}<br/>";
+		echo "<strong>Cache Misses:</strong> {$this->cache_misses}<br/>";
+		echo "</p>";
+
+		foreach ($this->cache as $group => $cache) {
+			echo "<p>";
+			echo "<strong>Group:</strong> $group<br/>";
+			echo "<strong>Cache:</strong>";
+			echo "<pre>";
+			print_r($cache);
+			echo "</pre>";
+			if (isset ($this->dirty_objects[$group])) {
+				echo "<strong>Dirty Objects:</strong>";
+				echo "<pre>";
+				print_r(array_unique($this->dirty_objects[$group]));
+				echo "</pre>";
+				echo "</p>";
+			}
+		}
+	}
+
+	function WP_Object_Cache() {
+		return $this->__construct();
+	}
+
+	function __construct() {
+		global $blog_id;
+
+		register_shutdown_function(array(&$this, "__destruct"));
+
+		if (defined('DISABLE_CACHE'))
+			return;
+
+		if ( ! defined('ENABLE_CACHE') )
+			return;
+
+		// Disable the persistent cache if safe_mode is on.
+		if ( ini_get('safe_mode') && ! defined('ENABLE_CACHE') )
+			return;
+
+		if (defined('CACHE_PATH'))
+			$this->cache_dir = CACHE_PATH;
+		else
+			// Using the correct separator eliminates some cache flush errors on Windows
+			$this->cache_dir = ABSPATH.'wp-content'.DIRECTORY_SEPARATOR.'cache'.DIRECTORY_SEPARATOR;
+
+		if (is_writable($this->cache_dir) && is_dir($this->cache_dir)) {
+				$this->cache_enabled = true;
+		} else {
+			if (is_writable(ABSPATH.'wp-content')) {
+				$this->cache_enabled = true;
+			}
+		}
+
+		if (defined('CACHE_EXPIRATION_TIME'))
+			$this->expiration_time = CACHE_EXPIRATION_TIME;
+
+		if ( defined('WP_SECRET') )
+			$this->secret = WP_SECRET;
+		else
+			$this->secret = DB_PASSWORD . DB_USER . DB_NAME . DB_HOST . ABSPATH;
+
+		$this->blog_id = $this->hash($blog_id);
+	}
+
+	function __destruct() {
+		$this->save();
+		return true;
+	}
+}
+?>
-- 
cgit