PHP Memory Cache Implementation program code

1.Memcached Cache.
Memcached is a high-performance distributed memory cache server, which reduces the number of database visits by caching database query results to improve the speed of dynamic Web applications. Memcached uses the "Key=>value" method to organize the data. You can allow multiple users on different hosts to access the caching system at the same time, typically for use with large web sites. Memcached uses memory to cache data, so it is volatile, and when the server restarts, or the memcached process aborts, the data is lost, so memcached cannot be used to persist the data.

People who have php_memcache feel that the PHP memory cache is a very complex thing, but it is not.
Memcached is an efficient and fast distributed memory object caching system, which is mainly used to speed up WEB dynamic applications.
This article describes the configuration of memcached under WIN32 and its use.

One, PHP memory cache configuration (WIN32 environment)

1, download Php_memcache.rar, please download from the attachment.

Decompression Compression Package: Php_memcache.rar

The main files contained in the Php_memcache.rar compression package are:

/memcached-1.2.1-win32/memcached.exe
/php_memcache/php_memcache.dll

2, open the command prompt, point to the path to Memcached.exe, run memcached.exe-d start.

3, copy the Php_memcache.dll file to the PHP Dynamic File Library folder.

4. Add a line of Extension=php_memcache.dll to the php.ini file.

5, restart Apache, and then look at the phpinfo, if there is memcache, then the installation is successful!

Cases:

The code is as follows

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<?php Contains memcached class files Require_once (' memcached-client.php '); Option settings $options = Array ( ' Servers ' => array (' www.hxsd.com:11211 '),//memcached service address, port ' Debug ' => true,//whether to turn on debug ' Compress_threshold ' => 10240,//more than the number of bytes of data to compress ' Persistant ' => false//whether to use persistent connections ); Instantiating a Memcached object $memcached = new memcached ($options); $sql = ' SELECT * from table1 '; $key = MD5 ($sql); If no data is cached in the memcached, the cached data is written to the memcached if (!) ( $datas = $memcached->get ($key))) { $conn = mysql_connect (' localhost ', ' hxsd ', ' 123456 '); mysql_select_db (' hxsd '); $result = mysql_query ($sql); while ($row = Mysql_fetch_object ($result)) { $datas [] = $row; } Saves the result set data obtained in the database to memcached for use on the next visit. $memcached->add ($key, $datas); } Else { Direct use of cached data in memcached $datas } ?>

Memory Cache Two

Comparison of APC, EC and Zend Accelerator

First, APC

APC, the full name is alternative PHP cache, official translation is called "Optional PHP caching."

Homepage is HTTP://PECL.PHP.NET/PACKAGE/APC

PHP help book page: HTTP://CN.PHP.NET/APC

APC is an optimizer, from the date of installation, silently in the background for your PHP application services. All your PHP code will be cached. (for PHP opcode)

In addition, APC provides a certain amount of memory caching. But this feature is not perfect, and there are reports that if you use the APC cache write feature frequently, it can cause unpredictable errors. If you want to use this feature, you may look at the APC_FETCH,APC_ A few functions associated with the APC cache, such as the store.

Installation:

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# pecl Install APC

Configuration: (/etc/php.inc)

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Extension=apc.so

[APC]

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apc.enabled = 1 Apc.shm_segments = 1 Apc.shm_size = + Apc.optimization = 0 Apc.ttl = 7200 Apc.use R_ttl = 7200 Apc.num_files_hint = 1000 Apc.mmap_file_mask =/tmp/apc. XXXXXX