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<?php $time = array( false, 'sdfasas', '0000-00-00', '0000-00-00 00:00:00', '1231231', 'bkasfkf' ); foreach($time as $s) { $iStartTime = ((strtotime($s) >= 0) ? strtotime($s) : 0); var_dump($iStartTime); }

preferences:
38.76 ms | 402 KiB | 5 Q