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(PECL memcache >= 0.2.0)
Memcache::delete — Delete item from the server
Memcache::delete() deletes an item with the key.
The key associated with the item to delete.
This deprecated parameter is not supported, and defaults to 0 seconds. Do not use this parameter.
| Version | Beschreibung |
|---|---|
| Unknown | It's not recommended to use the timeout parameter. The behavior differs between memcached versions, but setting to 0 is safe. Other values for this deprecated feature may cause the memcache delete to fail. |
Gibt bei Erfolg TRUE zurück. Im Fehlerfall wird FALSE zurückgegeben.
Beispiel #1 Memcache::delete() example
<?php
/* procedural API */
$memcache_obj = memcache_connect('memcache_host', 11211);
/* item will be deleted by the server */
memcache_delete($memcache_obj, 'key_to_delete');
/* OO API */
$memcache_obj = new Memcache;
$memcache_obj->connect('memcache_host', 11211);
$memcache_obj->delete('key_to_delete');
?>
According to the documents, $timeout is not required, but for me if I did not include it regardless of value, it fired an error. I made a simple fix for it.
<?php
class memcache_tools extends memcache
{
public function delete($key, $expire=0)
{
parent::delete($key, $expire);
}
}
?>
This will force it to behave as it should regardless of version.
Regardless of whether or not it succeeds, for me on Ubuntu 10.04 it always returns false. Just an FYI, you can't seem to rely on the result.
the Memcache::delete(key) function is broken on several combinations of memcached+pecl-memcache combinations.
pecl-memcache 2.2.5 + memcached 1.4.2 - Memcache::delete(key) WORKS
pecl-memcache 2.2.5 + memcached 1.4.3 - Memcache::delete(key) DOES NOT WORK
pecl-memcache 2.2.5 + memcached 1.4.4 - Memcache::delete(key) WORKS
pecl-memcache 2.2.5 + memcached 1.4.5 - Memcache::delete(key) WORKS
pecl-memcache 3.0.4 + memcached 1.4.2 - Memcache::delete(key) WORKS
pecl-memcache 3.0.4 + memcached 1.4.3 - Memcache::delete(key) DOES NOT WORK
pecl-memcache 3.0.4 + memcached 1.4.4 - Memcache::delete(key) DOES NOT WORK
pecl-memcache 3.0.4 + memcached 1.4.5 - Memcache::delete(key) DOES NOT WORK
To workaround the "delete" issue just pass zero as timeout parameter.
Hi,
Be careful about multi memcached servers. It seems logical the get() methods use only one server but, what about the delete() and update() methods?
In fact, at least the delete() method perform a delete on the first server it finds!
For the test code, you can see it there:
http://pecl.php.net/bugs/bug.php?id=16810
Hope this helps someone!
Wilfried
I was searching for a function/method in this class that would "reset" (or "update", depending on how you look at it) the timeout value for a key. I was searching my butt off when I finally figured; this is the one.
Example: You have accessed a web-page including something that should be "in-cache" for way more than 30 days (until the memcache server gets a downtime for some reason). Since the limit for having something in the cache is 30 days, this will be a problem. Simple (yet somewhat non-optimal) solution:
<?php
//How to "update" the value
if($memcache_key_exists){
$memcache_obj->delete('key', (3600*24*30));
}
?>
Have fun.
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