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(PECL mongo >= 1.5.0)
Examples:
Catching MongoDuplicateKeyException
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<?php
$mc = new MongoClient("localhost");
 
$c = $mc->selectCollection("test", "test");
 
$c->insert(array('_id' => 1));
try {
    $c->insert(array('_id' => 1));
} catch (MongoWriteConcernException $e) {
    echo $e->getMessage(), "\n";
}
?>

The above examples will output something similar to:

localhost:27017: insertDocument :: caused by :: 11000 E11000 duplicate key error index: test.test.$_id_  dup key: { : 1 }