(PECL memcached >= 0.1.0)
Memcached::set — Store an item
   Memcached::set() stores the value
   on a memcache server under the specified key. The
   expiration parameter can be used to control when the
   value is considered expired.
  
   The value can be any valid PHP type except for resources, because those
   cannot be represented in a serialized form. If the
   Memcached::OPT_COMPRESSION option is turned on, the
   serialized value will also be compressed before storage.
  
keyThe key under which to store the value.
valueThe value to store.
expirationThe expiration time, defaults to 0. See Expiration Times for more info.
   Returns TRUE on success or FALSE on failure.
   Use Memcached::getResultCode() if necessary.
  
Example #1 Memcached::set() example
<?php
$m = new Memcached();
$m->addServer('localhost', 11211);
$m->set('int', 99);
$m->set('string', 'a simple string');
$m->set('array', array(11, 12));
/* expire 'object' key in 5 minutes */
$m->set('object', new stdclass, time() + 300);
var_dump($m->get('int'));
var_dump($m->get('string'));
var_dump($m->get('array'));
var_dump($m->get('object'));
?>
The above example will output something similar to:
int(99)
string(15) "a simple string"
array(2) {
  [0]=>
  int(11)
  [1]=>
  int(12)
}
object(stdClass)#1 (0) {
}