2.13.4.9. Memcache (d) setup in OpenCart

Setting process Memcache(d) differs in different versions of OpenCart.

OpenCart 3.0
OpenCart 2.2-2.3
OpenCart 2.0-2.1
OpenCart 1.5

At the end of each of the two configuration files add code like this:
```
// CACHE
define('CACHE_HOSTNAME', '/home/example/.system/memcache/socket');
define('CACHE_PORT', '0');
define('CACHE_PREFIX', 'oc_');
```
In the line with the parameter CACHE_HOSTNAME insteadof example indicate hosting account namein which the site is hosted.

Edit the file default.phplocated in the directory system/config:

Find a block of code like this:

// Cache
$_['cache_engine'] = 'file'; // apc, file, mem or memcached
$_['cache_expire'] = 3600;

In the line with the parameter cache_engine replace file on memcachedso that the block of code looks like this:

// Cache
$_['cache_engine'] = 'memcached'; // apc, file, mem or memcached
$_['cache_expire'] = 3600;

Check the site is working.

At the end of each of the two configuration files add code like this:
```
// CACHE
define('CACHE_HOSTNAME', 'unix:///home/example/.system/memcache/socket');
define('CACHE_PORT', '0');
define('CACHE_PREFIX', 'oc_');
```
In the line with the parameter CACHE_HOSTNAME insteadof example indicate hosting account namein which the site is hosted.
Edit the file default.phplocated in the directory system/config:
- Find a block of code like this:
```
// Cache
$_['cache_type'] = 'file'; // apc, file or mem
$_['cache_expire'] = 3600;
```
- In the line with the parameter cache_type replace file on memso that the block of code looks like this:
```
// Cache
$_['cache_type'] = 'mem'; // apc, file or mem
$_['cache_expire'] = 3600;
```
Check the site is working.

At the end of each of the two configuration files add code like this:
```
// CACHE
define('CACHE_HOSTNAME', 'unix:///home/example/.system/memcache/socket');
define('CACHE_PORT', '0');
define('CACHE_PREFIX', 'oc_');
```
In the line with the parameter CACHE_HOSTNAME insteadof example indicate hosting account namein which the site is hosted.
Edit two files index.phpone of which is in root directory site, the second - in the subdirectory admin:
- Find a block of code like this:
```
// Cache
$cache = new Cache('file');
$registry->set('cache', $cache);
```
- On a line with a variable $cache replace file on memso that the block of code looks like this:
```
// Cache
$cache = new Cache('mem');
$registry->set('cache', $cache);
```
Check the site is working.

At the end of each of the two configuration files add code like this:

define('CACHE_DRIVER', 'memcached');
define('MEMCACHE_HOSTNAME', 'unix:///home/example/.system/memcache/socket');
define('MEMCACHE_PORT', '0');
define('MEMCACHE_NAMESPACE', 'opencart_test');

In the line with the parameter MEMCACHE_HOSTNAME insteadof example indicate hosting account namein which the site is hosted.

Replace the entire contents of the file system/library/cache.php to the following:

<?php
final class Cache {
    private $expire;
    private $memcache;
    private $ismemcache = false;
    public function __construct($exp = 3600) {
        $this->expire = $exp;
        if (CACHE_DRIVER == 'memcached') {
            $mc = new Memcache;
            if ($mc->pconnect(MEMCACHE_HOSTNAME, MEMCACHE_PORT)) {
                $this->memcache = $mc;
                $this->ismemcache = true;
            };
        };
        $files = glob(DIR_CACHE . 'cache.*');
        if ($files) {
            foreach ($files as $file) {
                $time = substr(strrchr($file, '.'), 1);
                if ($time < time()) {
                    if (file_exists($file)) {
                        @unlink($file);
                    }
                }
            }
        }
    }
    public function get($key) {
        if ((CACHE_DRIVER == 'memcached') && $this->ismemcache) {
            return($this->memcache->get(MEMCACHE_NAMESPACE . $key, 0));
        } else {
            $files = glob(DIR_CACHE . 'cache.' . $key . '.*');
            if ($files) {
                foreach ($files as $file) {
                    $cache = '';
                    $handle = fopen($file, 'r');
                    if ($handle) {
                        $cache = fread($handle, filesize($file));
                        fclose($handle);
                    }
                    return unserialize($cache);
                }
            }
        }
    }
    public function set($key, $value) {
        if ((CACHE_DRIVER == 'memcached') && $this->ismemcache) {
            $this->memcache->set(MEMCACHE_NAMESPACE . $key, $value, 0, $this->expire);
        } else {
            $this->delete($key);
            $file = DIR_CACHE . 'cache.' . $key . '.' . (time() + $this->expire);
            $handle = fopen($file, 'w');
            fwrite($handle, serialize($value));
            fclose($handle);
        };
    }
    public function delete($key) {
        if ((CACHE_DRIVER == 'memcached') && $this->ismemcache) {
            $this->memcache->delete(MEMCACHE_NAMESPACE . $key);
        } else {
            $files = glob(DIR_CACHE . 'cache.' . $key . '.*');
            if ($files) {
                foreach ($files as $file) {
                    if (file_exists($file)) {
                        @unlink($file);
                        clearstatcache();
                    }
                }
            }
        }
    }
}
?>

Check the site is working.

2.13.4.9. Memcache (d) setup in OpenCart

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