Description:
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PDO::prepare returns false OR an exception

because the return value depends on the error mode ?!?

default behaviour is: 
return false

can be changed with
PDO->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_SILENT); 
or
PDO->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); 

Is it configurable in the php.ini ?

Can you please specify the documentation ?

Reproduce code:
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From manual page: pdo.prepare#Return Values
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Expected result:
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not relevant

Actual result:
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not relevant