Description:
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There is a small documentation bug at:

http://nl.php.net/manual/en/ref.memcache.php

It made me think the expiration didn't work.

$memcache->set('key', $tmp_object, 10) or die ("Failed to save data at the server");
echo "Store data in the cache (data will expire in 10 seconds)<br/>\n";

This should be something like:
$memcache->set('key', $tmp_object, 0, 10) or die ("Failed to save data at the server");
echo "Store data in the cache (data will expire in 10 seconds)<br/>\n";





Expected result:
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Data stored in the cache for 10 seconds

Actual result:
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Data stays in cache for a long time