Callbacks
Read-through cache callbacks
Callbacks
PHP Manual

## Result callbacks

Result callbacks are invoked by Memcached::getDelayed or Memcached::getDelayedBykey methods for each item in the result set. The callback is passed the Memcached object and the array with the item information. The callback does not have to return anything.

Example #1 Result callback example

`<?php
$m = new Memcached();
$m->addServer('localhost', 11211);
$items = array(
'key1' => 'value1',
'key2' => 'value2',
'key3' => 'value3'
);
$m->setMulti($items);
$m->getDelayed(array('key1', 'key3'), true, 'result_cb');
function result_cb($memc, $item)
{
var_dump($item);
}
?>`

El resultado del ejemplo seria algo similar a:

    array(3) {
      ["key"]=>
      string(4) "key1"
      ["value"]=>
      string(6) "value1"
      ["cas"]=>
      float(49)
    }
    array(3) {
      ["key"]=>
      string(4) "key3"
      ["value"]=>
      string(6) "value3"
      ["cas"]=>
      float(50)
    }

Callbacks
Read-through cache callbacks
Callbacks
PHP Manual