Description:
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From manual page: https://php.net/pdo.construct
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The description of Errors/Exceptions states "PDO::__construct() throws a PDOException if the attempt to connect to the requested database fails."

However the default PDO::ATTR_ERRMODE for PDO is PDO::ERRMODE_SILENT, which requires the use of  PDO::errorInfo() or PDO::errorCode() and does not throw an exception as indicated

The documentation should include information about the PDO::ATTR_ERRMODE attribute being set to PDO::ERRMODE_SLIENT by default and that an exception is thrown only when the PDO::ATTR_ERRMODE attribute is set to PDO::ERRMODE_EXCEPTION.

Test script:
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new PDO ("mysql:localhost; dbname=test", "root", "");
//invalid DSN usage

Expected result:
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An exception to be thrown

Actual result:
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No Exception is thrown by default due to PDO::ERRMODE_SLIENT