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