Description:
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From manual page: http://www.php.net/datetime.getlasterrors#refsect1-datetime.getlasterrors-returnvalues
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DateTime::getLastErrors documentation should note that the return errors are not error codes, but instead are the index where the error was found.

Suggested change:
Returns array containing info about warnings and errors.  The errors/warnings are indexed by the position in the string where the error/warning was found.