WordPress给网站配置Redis 缓存的例子

$start = microtime(); // start timing page exec

// if cloudflare is enabled
if ($cf) {
if (isset($_SERVER['HTTP_CF_CONNECTING_IP'])) {
$_SERVER['REMOTE_ADDR'] = $_SERVER['HTTP_CF_CONNECTING_IP'];
}
}

// from wp
define('WP_USE_THEMES', true);

// init predis
include("predis.php");
$redis = new PredisClient('');

// init vars
$domain = $_SERVER['HTTP_HOST'];
$url = "http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];
$url = str_replace('?r=y', '', $url);
$url = str_replace('?c=y', '', $url);
$dkey = md5($domain);
$ukey = md5($url);

// check if page isn't a comment submission
(isset($_SERVER['HTTP_CACHE_CONTROL']) && $_SERVER['HTTP_CACHE_CONTROL'] == 'max-age=0') ? $submit = 1 : $submit = 0;

// check if logged in to wp
$cookie = var_export($_COOKIE, true);
$loggedin = preg_match("/wordpress_logged_in/", $cookie);

// check if a cache of the page exists
if ($redis->hexists($dkey, $ukey) && !$loggedin && !$submit && !strpos($url, '/feed/')) {

echo $redis->hget($dkey, $ukey);
$cached = 1;
$msg = 'this is a cache';

// if a comment was submitted or clear page cache request was made delete cache of page
} else if ($submit || substr($_SERVER['REQUEST_URI'], -4) == '?r=y') {

require('./wp-blog-header.php');
$redis->hdel($dkey, $ukey);
$msg = 'cache of page deleted';

// delete entire cache, works only if logged in
} else if ($loggedin && substr($_SERVER['REQUEST_URI'], -4) == '?c=y') {

require('./wp-blog-header.php');
if ($redis->exists($dkey)) {
$redis->del($dkey);
$msg = 'domain cache flushed';
} else {
$msg = 'no cache to flush';
}

// if logged in don't cache anything
} else if ($loggedin) {

require('./wp-blog-header.php');
$msg = 'not cached';

// cache the page
} else {

// turn on output buffering
ob_start();

require('./wp-blog-header.php');

// get contents of output buffer
$html = ob_get_contents();

// clean output buffer
ob_end_clean();
echo $html;

// Store to cache only if the page exist and is not a search result.
if (!is_404() && !is_search()) {
// store html contents to redis cache
$redis->hset($dkey, $ukey, $html);
$msg = 'cache is set';
}
}

$end = microtime(); // get end execution time

// show messages if debug is enabled
if ($debug) {
echo $msg.': ';
echo t_exec($start, $end);
}

if ($cached && $display_powered_by_redis) {
// You should move this CSS to your CSS file and change the: float:right;margin:20px 0;
echo "<style>#redis_powered{float:right;margin:20px 0;background:url(yun_qi_img/redis.png) 10px no-repeat #fff;border:1px solid #D7D8DF;padding:10px;width:190px;}
#redis_powered div{width:190px;text-align:right;font:10px/11px arial,sans-serif;color:#000;}</style>";
echo "<a href="http://www.aips.me/wordpress-with-redis-as-a-frontend-cache/" style="text-decoration:none;"><div id="redis_powered"><div>Page generated in<br/> ".t_exec($start, $end)." sec</div></div></a>";
}

// time diff
function t_exec($start, $end) {
$t = (getmicrotime($end) - getmicrotime($start));
return round($t,5);
}

// get time
function getmicrotime($t) {
list($usec, $sec) = explode(" ",$t);
return ((float)$usec + (float)$sec);
}

?>