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mongodb sort

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<?php
$m = new Mongo();
$db = $m->sampledb;
$col = $db->samplecol;
$col->drop();
for ($i = 0; $i < 20; $i++) {
  //  echo rand() . "\n";                                                       
  $col->insert(array('num' => rand() % 20,
                     'date' => new MongoDate(),
                     ));
  sleep(1);
}
$cur = $col->find();
$cur->sort(array('date' => -1))->limit(5);
foreach ($cur as $obj) {
  var_dump($obj);
}
?>

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