PHP: Result callbacks

Result callbacks

Result callables 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);
}
?>

The above example will output something similar to:

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)
}

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User Contributed Notes 1 note

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edwarddrapkin at gmail dot com ¶

15 years ago

I was having trouble making method calls with the result callbacks in getDelayed, so I emailed the developer.



If you want to use a non-static method as a callback, use the following format: array($obj, 'method'); for example:



<?php

class foo {

    private $M = false;

    

    public function __construct() {

        $this->M = new Memcached();

        $this->M->addServer('localhost', 11211);        

        $this->M->set('a', 'test');

    }



    public function test() {

        $this->M->getDelayed(array('a'), false, array($this, 'fun'));

    }

    

    public function fun() {

        echo "Great Success!";

    }

}



$f = new foo();

$f->test();

?>



or, alternatively:



<?php

class foo {

    public $M = false;

    

    public function __construct() {

        $this->M = new Memcached();

        $this->M->addServer('localhost', 11211);        

        $this->M->set('a', 'test');

    }

    

    public function fun() {

        echo "Great Success!";

    }

}



$f = new foo();

$f->M->getDelayed(array('a'), false, array($f, 'fun'));

?>



Works great, thanks Andrei :)

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