APC
It seems there are issues when using APC to cache database result sets as PDOStatements. Any attempts I have made always result in an exception being thrown with the message: 'You cannot serialize or unserialize PDOStatement instances'
APC Функции
Содержание
- apc_add — Cache a variable in the data store
- apc_cache_info — Retrieves cached information from APC's data store
- apc_clear_cache — Clears the APC cache
- apc_compile_file — Stores a file in the bytecode cache, bypassing all filters.
- apc_define_constants — Defines a set of constants for retrieval and mass-definition
- apc_delete — Removes a stored variable from the cache
- apc_fetch — Fetch a stored variable from the cache
- apc_load_constants — Loads a set of constants from the cache
- apc_sma_info — Retrieves APC's Shared Memory Allocation information
- apc_store — Cache a variable in the data store
add a note
User Contributed NotesAPC Функции
joe at simpson dot com
20-Sep-2007 02:53
20-Sep-2007 02:53
zytzagoo at NOSPAMPLEASEgmail dot com
30-Jul-2007 04:21
30-Jul-2007 04:21
Keep in mind to always prefix or suffix your cache key names with something specific to your site/app/setup, to avoid the risk of your apc cache entries being overwritten/deleted/modified by someone else on the same server.
Assume we have some code like this:
apc_store('config', $cfg);
Now assume someone else on the same server is also using 'config' as the key passed to an apc_store(), apc_delete() (etc.) call in some other piece of code on the whole server.
Since you're both working on the exact same cache entry, all sorts of wierd things can happen, but the problem is not in your code at all.
anon
03-Jul-2007 10:28
03-Jul-2007 10:28
If you don't want any APC info visible without logging in, insert this code at line 173 of apc.php:
<?
if (!$AUTHENTICATED) {
echo '<div class="authneeded">You need to login to see the user values here!<br/> <br/>';
put_login_link("Login now!");
echo '</div>';
die();
}
?>
bjoern dot andersen at atosorigin dot com
23-May-2007 06:14
23-May-2007 06:14
In IIS6 you can't use php_apc.dll with application pools or webgardens (Multi-Instance/Multi-Threading). Maybe this applies even to all Multithreading environments - i don't know.
When you try it, the Application pools terminate when requests run simultaneously.
jphp at dsf dot org dot uk
04-Apr-2007 05:37
04-Apr-2007 05:37
An improvement on ashus at atlas dot cz's script below would be to add around the script that generates the output:
<?php
//...
ob_start ();
// script goes here
$out = ob_get_content();
ob_end_clean ();
//...
?>
That way you can continue to use echo rather than string concatenation, and it should be a little faster.
ashus at atlas dot cz
21-Mar-2007 04:56
21-Mar-2007 04:56
If you don't really need caching and plan to use it for one page only, you could try an alternative; writing a file and then flushing it back if specified time hasn't passed. I use it to read and parse third party websites, to check for new subtitles and output a RSS xml file.
<?php
if ((is_file($_SERVER['SCRIPT_FILENAME'].'.cached'))
&& (time()-filemtime($_SERVER['SCRIPT_FILENAME'].'.cached') < 3600))
{
readfile($_SERVER['SCRIPT_FILENAME'].'.cached');
exit;
}
// (the php script itself goes here)
echo $out;
$fp = fopen($_SERVER['SCRIPT_FILENAME'].'.cached', 'w');
fwrite($fp, $out);
fclose($fp);
?>
Note, that this only works for pages, which are without GET or POST variables, sessions, etc. You can change the number of seconds the cache works for (3600 = an hour). Also, use "$out.=" instead of "echo" command. Just store all output to that variable (if you need to use it inside a function, use "global $out" instead).
This workaround was written in about 5 minutes and may contain bugs.
dustymugs
31-Jan-2007 04:14
31-Jan-2007 04:14
In windows, if you load php_apc.dll but do not enable it, apache may crash when attempting to restart or stop.
So, if you've not enabled APC but are loading it, comment out the loading.