Ubuntu 10.10下Memcache類delete失敗的原因

1. <?php
2. $mem = new Memcache;
3. $mem->connect('127.0.0.1',11211);
4. $mem->delete('key');
5. ?>

結果在delete的時候老是報錯：

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

查找了半天原因發現在delete後面加個參數就可以了，而且這個參數必須是0，其它的值同樣報錯：

1. <?php
2. $mem = new Memcache;
3. $mem->connect('127.0.0.1',11211);
4. $mem->delete('key',0);
5. ?>

後來百度+GG找，原因如下：

1. nibblebot at gmail dot com 09-Jul-2010 03:58
2. the Memcache::delete(key) function is broken on several combinations of memcached+pecl-memcache combinations.
4. pecl-memcache 2.2.5 + memcached 1.4.2 - Memcache::delete(key) WORKS
6. pecl-memcache 2.2.5 + memcached 1.4.3 - Memcache::delete(key) DOES NOT WORK
8. pecl-memcache 2.2.5 + memcached 1.4.4 - Memcache::delete(key) WORKS
10. pecl-memcache 2.2.5 + memcached 1.4.5 - Memcache::delete(key) WORKS
12. pecl-memcache 3.0.4 + memcached 1.4.2 - Memcache::delete(key) WORKS
14. pecl-memcache 3.0.4 + memcached 1.4.3 - Memcache::delete(key) DOES NOT WORK
16. pecl-memcache 3.0.4 + memcached 1.4.4 - Memcache::delete(key) DOES NOT WORK
18. pecl-memcache 3.0.4 + memcached 1.4.5 - Memcache::delete(key) DOES NOT WORK

解決方案：(1)手動安裝對應的版本 (2)在delete函數裡面多加一個參數0。