Memcache::decrement
Meanwhile they added partial backwards compatibility for delete with timeout in memcached 1.4.4.
Memcache::delete
(PECL memcache >= 0.2.0)
Memcache::delete — サーバから項目を削除する
説明
bool Memcache::delete
( string $key
[, int $timeout
] )
Memcache::delete() は、 key に対応する項目を削除します。 パラメータ timeout が指定されている場合は、 その項目は timeout 秒が経過した後に 期限切れとなります。 memcache_delete() 関数を使用することも可能です。
パラメータ
- key
-
削除したい項目のキー。
- timeout
-
その項目の実行時間。 ゼロの場合は即時に削除されます。 たとえば 30 を設定すると、 その項目は 30 秒後に削除されます。
返り値
成功した場合に TRUE を、失敗した場合に FALSE を返します。
例
例1 Memcache::delete() の例
<?php
/* 手続き型の API */
$memcache_obj = memcache_connect('memcache_host', 11211);
/* 10 秒後に、項目がサーバから削除されます */
memcache_delete($memcache_obj, 'key_to_delete', 10);
/* オブジェクト指向の API */
$memcache_obj = new Memcache;
$memcache_obj->connect('memcache_host', 11211);
$memcache_obj->delete('key_to_delete', 10);
?>
add a note
User Contributed NotesMemcache::delete
MariusM
27-Nov-2009 08:46
27-Nov-2009 08:46
harv at pringo dot com
10-Nov-2009 11:17
10-Nov-2009 11:17
With the recent versions of memcached 1.4.3, the delete returns false because there is an error with the latest stable pecl extension 2.2.5.
Running memcached in -vvv mode will show why deletes fail:
CLIENT_ERROR bad command line format. Usage: delete <key> [noreply]
Simple fix, updated your memcache.c in your PECL extension at line 1494, in the mmc_delete() function. Change the command_len to the following:
command_len = spprintf(&command, 0, "delete %s", key);
This basically gets rid of that deprecated 3rd parameter, and deletes will work again. Hope this helps somebody (and gets fixed eventually).
Wilfried Loche
25-Aug-2009 09:01
25-Aug-2009 09:01
Hi,
Be careful about multi memcached servers. It seems logical the get() methods use only one server but, what about the delete() and update() methods?
In fact, at least the delete() method perform a delete on the first server it finds!
For the test code, you can see it there:
http://pecl.php.net/bugs/bug.php?id=16810
Hope this helps someone!
Wilfried
Jocke Berg
05-May-2009 10:02
05-May-2009 10:02
I was searching for a function/method in this class that would "reset" (or "update", depending on how you look at it) the timeout value for a key. I was searching my butt off when I finally figured; this is the one.
Example: You have accessed a web-page including something that should be "in-cache" for way more than 30 days (until the memcache server gets a downtime for some reason). Since the limit for having something in the cache is 30 days, this will be a problem. Simple (yet somewhat non-optimal) solution:
<?php
//How to "update" the value
if($memcache_key_exists){
$memcache_obj->delete('key', (3600*24*30));
}
?>
Have fun.