Memcached
PHP Manual

Memcached::cas

Compare and swap an item

Description

public bool Memcached::cas ( float $cas_token , string $key , mixed $value [, int $expiration ] )

Memcached::cas performs a "check and set" operation, so that the item will be stored only if no other client has updated it since it was last fetched by this client. The check is done via the cas_token parameter which is a unique 64-bit value assigned to the existing item by memcache. See the documentation for Memcached::get* methods for how to obtain this token. Note that the token is represented as a double due to the limitations of PHP's integer space.

Parameters

cas_token

Unique value associated with the existing item. Generated by memcache.

key

The key under which to store the value.

value

The value to store.

expiration

The expiration time, defaults to 0. See Expiration Times for more info.

Return Values

Returns TRUE on success or FALSE on failure. The Memcached::getResultCode will return Memcached::RES_DATA_EXISTS if the item you are trying to store has been modified since you last fetched it.

Examples

Example #1 Memcached::cas example

<?php
$m = new Memcached();
$m->addServer('localhost', 11211);

do {
    /* fetch IP list and its token */
    $ips = $m->get('ip_block', null, $cas);
    /* if list doesn't exist yet, create it and do
       an atomic add which will fail if someone else already added it */
    if ($m->getResultCode() == Memcached::RES_NOTFOUND) {
        $ips = array($_SERVER['REMOTE_ADDR']);
        $m->add('ip_block', $ips);
    /* otherwise, add IP to the list and store via compare-and-swap
       with the token, which will fail if someone else updated the list */
    } else { 
        $ips[] = $_SERVER['REMOTE_ADDR'];
        $m->cas($cas, 'ip_block', $ips);
    }   
} while ($m->getResultCode() != Memcached::RES_SUCCESS);

?>

See Also

  • Memcached::casByKey