<?php/* * 普通hash分布式算法 * @param $key * @return int */class Hash{ protected $_serverList = array(); public function __construct($_serverList){ if(is_array($_serverList)){ $this->_serverList = $_serverList; }else{ return false; } } //通过hash算法返回一个整数值 protected function myHash($key){ $md5 = substr(md5($key),0,8); $seed = 31; //种子值 $hash=0; for($i=0;$i<8;$i++){ $hash = $hash*$seed+ord($md5{$i}); //ord 返回ascii值 $i++; } return $hash&0x7FFFFFFF; //0x7FFFFFFF表示最大值 } public function getServer($key){ $servers = $this->_serverList; $rs = $servers[$this->myHash($key)%(count($servers))]; return $rs; }}$servers = array( array('host'=>'192.168.1.1','port'=>6397), array('host'=>'192.168.1.2','port'=>6397), array('host'=>'192.168.1.3','port'=>6397), array('host'=>'192.168.1.4','port'=>6397), array('host'=>'192.168.1.5','port'=>6397), array('host'=>'192.168.1.6','port'=>6397), array('host'=>'192.168.1.7','port'=>6397),);$key = 'TheKey'.rand(0,99999);$value = 'TheValue';$hash = new Hash($servers);if($hash){ $server = $hash->getServer($key); // $memcached = new Memcached($sc); // $memcached->set($key,$value);}?> 
