mirror of
https://github.com/sigmasternchen/php-doc-en
synced 2025-03-19 10:28:54 +00:00
af4410a7e1
still using this, after discussion on the phpdoc list. From now on, manual.ced will need to be found at ~/.phpdoc/manual.ced. git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@288721 c90b9560-bf6c-de11-be94-00142212c4b1
120 lines
3 KiB
XML
120 lines
3 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
|
|
<!-- $Revision$ -->
|
|
|
|
<chapter xml:id="memcached.callbacks" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
|
|
<title>Callbacks</title>
|
|
|
|
<section xml:id="memcached.callbacks.result">
|
|
<title>Result callbacks</title>
|
|
<para>
|
|
Result <type>callbacks</type> are invoked by
|
|
<methodname>Memcached::getDelayed</methodname> or
|
|
<methodname>Memcached::getDelayedBykey</methodname> 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.
|
|
</para>
|
|
<example>
|
|
<title>Result callback example</title>
|
|
<programlisting role="php">
|
|
<![CDATA[
|
|
<?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);
|
|
}
|
|
?>
|
|
]]>
|
|
</programlisting>
|
|
&example.outputs.similar;
|
|
<screen>
|
|
<![CDATA[
|
|
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)
|
|
}
|
|
]]>
|
|
</screen>
|
|
</example>
|
|
</section>
|
|
|
|
<section xml:id="memcached.callbacks.read-through">
|
|
<title>Read-through cache callbacks</title>
|
|
<para>
|
|
Read-through cache callbacks are invoked when an item cannot be retrieved
|
|
from the server. The callback is passed the Memcached object, the requested
|
|
key, and the by-reference value variable. The callback is responsible for
|
|
setting the value and returning true or false. If the callback returns true,
|
|
Memcached will store the populated value on the server and return it to the
|
|
original calling function. Only <methodname>Memcached::get</methodname> and
|
|
<methodname>Memcached::getByKey</methodname> support these callbacks,
|
|
because the memcache protocol does not provide information on which keys
|
|
were not found in the multi-key request.
|
|
</para>
|
|
<example>
|
|
<title>Read-through callback example</title>
|
|
<programlisting role="php">
|
|
<![CDATA[
|
|
<?php
|
|
$m = new Memcached();
|
|
$m->addServer('localhost', 11211);
|
|
|
|
$profile_info = $m->get('user:'.$user_id, 'user_info_cb');
|
|
|
|
function user_info_cb($memc, $key, &$value)
|
|
{
|
|
$user_id = substr($key, 5);
|
|
/* lookup profile info in the DB */
|
|
/* ... */
|
|
$value = $profile_info;
|
|
return true;
|
|
}
|
|
?>
|
|
]]>
|
|
</programlisting>
|
|
</example>
|
|
</section>
|
|
|
|
</chapter>
|
|
|
|
<!-- Keep this comment at the end of the file
|
|
Local variables:
|
|
mode: sgml
|
|
sgml-omittag:t
|
|
sgml-shorttag:t
|
|
sgml-minimize-attributes:nil
|
|
sgml-always-quote-attributes:t
|
|
sgml-indent-step:1
|
|
sgml-indent-data:t
|
|
indent-tabs-mode:nil
|
|
sgml-parent-document:nil
|
|
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
|
|
sgml-exposed-tags:nil
|
|
sgml-local-catalogs:nil
|
|
sgml-local-ecat-files:nil
|
|
End:
|
|
vim600: syn=xml fen fdm=syntax fdl=2 si
|
|
vim: et tw=78 syn=sgml
|
|
vi: ts=1 sw=1
|
|
-->
|