Description:
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From manual page: http://www.php.net/memcached.set
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The exmaple code is wrong:
/* expire 'object' key in 5 minutes */
$m->set('object', new stdclass, time() + 300);



Test script:
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The example is wrong.
$m->set('object', new stdclass, time() + 300);

If you want to store the data for 5 minute, you have to do this:

/* expire 'object' key in 5 minutes */
$m->set('object', new stdclass, 300);

Not: time() + 300;