Description:
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Documentation states:
Return Values
PDO::query() returns a PDOStatement object. 

Witch absolutely is not true for mysql!

if(PDO::ATTR_ERRMODE=0){PDO::query() will return FALSE;}
if(PDO::ATTR_ERRMODE=1){PDO::query() will return FALSE;} 
if(PDO::ATTR_ERRMODE=3){PDO::query() will return PDOStatement object;}

So either change PDO::query() function to always return PDOStatement object or add two sentences in PHP PDO documentation.

Reproduce code:
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$db=new PDO($dsn,$user,$pass,array(PDO::ATTR_ERRMODE=>0)); // or =>1
$sql='SELECT * from tblName';

$result= $db->query($sql); // as object
if($result==false){die('Look it actually is false!!!');}

Expected result:
----------------
What documentation states. ALWAYS PDOStatement!
Please fix documentation.

Actual result:
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if PDO::ERRMODE_SILENT $result is false
if PDO::ERRMODE_WARNING $result is false
if PDO::ERRMODE_EXCEPTION $result is PDOStatement