ubuntu10.10下memcache类delete失败的原因

 ubuntu10.10 desktop,安装了memcached，后来写了一个php文件来测试memcache：

connect('127.0.0.1',11211);
$mem->delete('key');
?>

结果在delete的时候老是报错：

coinsight@insight-ubuntu:~$ php clear.php    
PHP Notice:  MemcachePool::delete(): Server 127.0.0.1 (tcp 11211, udp 0) 
failed with: CLIENT_ERROR bad command line format.  Usage: delete  [noreply]   
 (0) in /home/coinsight/clear.php on line 4  
coinsight@insight-ubuntu:~$

查找了半天原因发现在delete后面加个参数就可以了，而且这个参数必须是0，其它的值同样报错：

connect('127.0.0.1',11211);
$mem->delete('key',0);
?>

后来百度+GG找，原因如下：

nibblebot at gmail dot com 09-Jul-2010 03:58 
the Memcache::delete(key) function is broken on several combinations of memcached+pecl-memcache combinations. 

pecl-memcache 2.2.5 + memcached 1.4.2 - Memcache::delete(key) WORKS

pecl-memcache 2.2.5 + memcached 1.4.3 - Memcache::delete(key) DOES NOT WORK

pecl-memcache 2.2.5 + memcached 1.4.4 - Memcache::delete(key) WORKS

pecl-memcache 2.2.5 + memcached 1.4.5 - Memcache::delete(key) WORKS

pecl-memcache 3.0.4 + memcached 1.4.2 - Memcache::delete(key) WORKS

pecl-memcache 3.0.4 + memcached 1.4.3 - Memcache::delete(key) DOES NOT WORK

pecl-memcache 3.0.4 + memcached 1.4.4 - Memcache::delete(key) DOES NOT WORK

pecl-memcache 3.0.4 + memcached 1.4.5 - Memcache::delete(key) DOES NOT WORK

 解决方案：(1)手动安装对应的版本 (2)在delete函数里面多加一个参数0。