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<?php private function timestampIsValid($timestampColumn, $requiredArray = array()) { $requiredArray[] = $this->$timestampColumn; $timestampIsValid = true; foreach($requiredArray as $key => $requiredTimestamp) { $isValidTimestamp = Validation::validateTimestamp($this->$requiredTimestamp); if ( $key === 0 && !$isValidTimestamp || ($key !== 0 && ($this->{$requiredArray[($key - 1)]} == '0000-00-00 00:00:00' || !Validation::validateTimestamp($this->{$requiredArray[($key - 1)]}) || strtotime($this->$requiredTimestamp) > strtotime($this->{$requiredArray[($key - 1)]}))) ) { $timestampIsValid = false; break; } } return $timestampIsValid; } }