Description:
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The PDO driver ignores the ATTR_ERRMODE attribute when it is 
passed in via the constructor.  Exceptions are thrown 
correctly when attributes are set via setAttribute().




Reproduce code:
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$connection = new PDO($url, $username, $password, array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));
$connection->prepare("SELECT 10 +");
$query->execute();

Expected result:
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Exception thrown.

Fatal error: Uncaught exception 'PDOException' with message 
'SQLSTATE[HY000]: General error: 20018 Incorrect syntax near 
'+'. [20018] (severity 5) [(null)]'

Actual result:
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No exception thrown.