apc_store

(PECL apc >= 3.0.0)

apc_store — Cache a variable in the data store

Beschreibung

bool apc_store ( string $key , mixed $var [, int $ttl = 0 ] )

array apc_store ( array $values [, mixed $unused [, int $ttl = 0 ]] )

Cache a variable in the data store.

Hinweis: Unlike many other mechanisms in PHP, variables stored using apc_store() will persist between requests (until the value is removed from the cache).

Parameter-Liste

key: Store the variable using this name. keys are cache-unique, so storing a second value with the same key will overwrite the original value.
var: The variable to store
ttl: Time To Live; store var in the cache for ttl seconds. After the ttl has passed, the stored variable will be expunged from the cache (on the next request). If no ttl is supplied (or if the ttl is 0), the value will persist until it is removed from the cache manually, or otherwise fails to exist in the cache (clear, restart, etc.).
values: Names in key, variables in value.

Rückgabewerte

Gibt bei Erfolg TRUE zurück. Im Fehlerfall wird FALSE zurückgegeben. Second syntax returns array with error keys.

Beispiele

Beispiel #1 A apc_store() example


<?php
$bar = 'BAR';
apc_store('foo', $bar);
var_dump(apc_fetch('foo'));
?>

Das oben gezeigte Beispiel erzeugt folgende Ausgabe:

string(3) "BAR"

Siehe auch

apc_add() - Cache a new variable in the data store
apc_fetch() - Fetch a stored variable from the cache
apc_delete() - Removes a stored variable from the cache

add a note User Contributed Notes
apc_store

JaskaS
01-Mar-2007 03:06


if you want to store array of objects in apc use ArrayObject wrapper (PHP5).



<?php

$objs = array();

$objs[] = new TestClass();

$objs[] = new TestClass();

$objs[] = new TestClass();



//Doesn't work

apc_store('objs',$objs,60);

$tmp = apc_fetch('objs'); 

print_r($tmp);



//Works

apc_store('objs',new ArrayObject($objs),60);

$tmp = apc_fetch('objs'); 

print_r($tmp->getArrayCopy());



?>

Roberto Spadim
12-Jan-2007 11:11


be sure that setting FALSE values can be wrong returned from fetch since fetch return FALSE on errors

php at tequilasolutions dot com
03-Nov-2006 12:45


Seems to be no (easy) way at the to know how old a value fetched is and to check whether it is out of date.



I've made these wrappers so that you can fetch and store values based on a udt returned from get_last_modified_date() which should return a udt of when your data was last changed, and hence needs junking out of the cache.



function apc_fetch_udt($key){

    $g = apc_fetch($key);

    if ($g){

        list($udt,$val) = $g;

        if (get_last_modified_date()<$udt) {

            $val = unserialize($val);

            return $val; 

        } else {

            apc_delete($key);

        }

    }

}

function apc_store_udt($key,$g){

    $udt = time();

    $g   = serialize($g);

    $apc = array($udt,$g);

    apc_store($key, $apc);

}

Sudhee
30-Oct-2006 01:09


It should be noted that apc_store appears to only store one level deep.  So if you have an array of arrays, and you store it.  When you pull it back out with apc_fetch it will only have the top level row of keys with nulls as the values of each key. 

 

Solution to this, is to serialize the data before storing it in the cache and unserialize it while retrieving from the cache.

php at metalshard dot com
29-Oct-2006 06:48


It should be noted that apc_store appears to only store one level deep.  So if you have an array of arrays, and you store it.  When you pull it back out with apc_fetch it will only have the top level row of keys with nulls as the values of each key.

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Last updated: Fri, 18 May 2012