Description:
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As you can see in above example (https://3v4l.org/0hf0u) I am setting PDO::ATTR_ERRMODE to PDO::ERRMODE_SILENT but somehow it does not make $pdo->getAttribute() silent. It is throwing an exception or warning, depending on setting, but it is IMPOSSIBLE to make it silent.

Test script:
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$pdo = new \PDO('sqlite::memory:');
$pdo->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_SILENT);

$pdo->getAttribute(1);

Expected result:
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NO WARNING

Actual result:
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Warning: SQLSTATE[IM001]: Driver does not support this function: driver does not support that attribute in /in/0hf0u on line 6