php memcache单例

1. 先将__construct()设置为 private 这样就不允许在外部 new 了
2. 在类的内部实例化一个对象。外部可以得到就行

classMemextendsMemcache{privatestatic$mem_instance = null;
    privatefunction__construct(){parent::__construct();
    }
    privatefunction__clone(){}
    publicstaticfunctionget_mem_ins(){if(null === self::$mem_instance){
            self::$mem_instance = new Memcache;
        }
        returnself::$mem_instance;
    }
}

1. memcache 操作

php
    //连接$mem=new Memcache;
    $mem->connect("db.nowamagic.net", 12000);
    //保存数据$mem->set('key1', 'This is first value', 0, 60);
    $val=$mem->get('key1');
    echo "Get key1 value: ".$val."
";
    //替换数据$mem->replace('key1', 'This is replace value', 0, 60);
    $val=$mem->get('key1');
    echo "Get key1 value: ".$val."
";
    //保存数组$arr=array('aaa', 'bbb', 'ccc', 'ddd');
    $mem->set('key2', $arr, 0, 60);
    $val2=$mem->get('key2');
    echo "Get key2 value: ";
    print_r($val2);
    echo "
";
    //删除数据$mem->delete('key1');
    $val=$mem->get('key1');
    echo "Get key1 value: ".$val."
";
    //清除所有数据$mem->flush();
    $val2=$mem->get('key2');
    echo "Get key2 value: ";
    print_r($val2);
    echo "
";
    //关闭连接$mem->close();
?>

1. 输出

Get key1 value: This is first value
Get key1 value: This is replace value
Get key2 value: Array ( [0] => aaa [1] => bbb [2] => ccc [3] => ddd )
Get key1 value:
Get key2 value: