How to operate memcache in php

How to operate memcache in php

In general, if the concurrency is not large, it does not affect the use of the cache technology. However, if the concurrency is high, it is very important to use the cache technology, it can effectively reduce the pressure on databases and servers. Of course, there are many technologies to solve high concurrency. Here, we only use the cache to describe the convenience and convenience of using memcache,

To use memcache, you must configure the memcahche environment on the server! After confirming that memcahce can be connected normally, it can be used in the program!

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<? Php /** * Memcache cache operations * @ Author hxm * @ Version 1.0 * @ Since 2015.05.04 */ Class MCache extends Object implements CacheFace { Private $ mem = null; // Mem object   Private $ sId = 1; // servier service ID   /** * Initialize Memcache * * @ Return Object */ Public function _ construct () { If (! Class_exists ('memcache ')) { Throw new QException ('php extension does not exist: memcache '); } $ This-> mem = new Memcache (); }   /** * Link to the memcahce Service * * @ Access private * @ Param string $ key keyword * @ Param string $ value cached content * @ Return array */ Private function connect ($ sid) { $ File = $ this-> CacheFile (); Require $ file; If (! Isset ($ cache )) { Throw new QException ('cache configuration file does not exist'. $ file ); } $ Server = $ cache [$ this-> cacheId]; $ Sid = isset ($ sid) = 0? $ This-> sId: $ sid; // memcache Service Selection If (! $ Server [$ sid]) { Throw new QException ('the current cache server configuration file does not exist '); } $ Host = $ server [$ sid] ['host']; $ Port = $ server [$ sid] ['Port']; Try { $ This-> mem-> connect ($ host, $ port ); } Catch (Exception $ e ){ Exit ('memecache connection failed, error message: '. $ e-> getMessage ()); } }   /** * Write Cache * * @ Access private * @ Param string $ key keyword * @ Param string $ value cached content * @ Return array */ Public function set ($ key, $ value, $ sid, $ expire = 0) { $ Data = $ this-> get ($ key, $ sid); // if the key value already exists If ($ data) { Return $ this-> mem-> set ($ key, $ value, MEMCACHE_COMPRESSED, $ expire ); } Else { Return $ this-> mem-> add ($ key, $ value, MEMCACHE_COMPRESSED, $ expire ); } }   /** * Read Cache * * @ Access private * @ Param string $ key keyword * @ Param int $ sid select the number of memcache servers * @ Return array */ Public function get ($ key, $ sid) { $ This-> connect ($ sid ); Return $ this-> mem-> get ($ key ); }   /** * Clean (delete) all elements that have been stored * * @ Access private * @ Return array */ Public function flush () { $ This-> connect (); Return $ this-> mem-> flush (); } /** * Delete Cache * * @ Access private * @ Param string $ key keyword * @ Param int $ sid select the number of memcache servers * @ Return array */ Public function remove ($ key, $ sid) { $ This-> connect (); Return $ this-> mem-> delete ($ key ); }   /** * Destructor * Disable memcache. */ Public function _ destruct () { /* If (! $ This-> mem) { $ This-> mem-> close (); }*/ } }

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