Visitor pattern example

visitor_CSVAbsenceTypeCleaner.php

<?php
class CSVAbsenceTypeCleaner extends CSVCleanerVisitor {

    public function visit(array $row) {
        $this->deleteRecord('HRAbsenceType', ['name' => $row['name']]);
    }
}

visitor_CSVAbsenceTypeImporter.php

<?php
class CSVAbsenceTypeImporter extends CSVImporterVisitor {

    function importRecord(array $row) {
        // code specific to import absence type here
    }

    public function visit(array $row) {
        $this->importRecord($row);
    }
}

visitor_CSVCleanerVisitor.php

<?php
abstract class CSVCleanerVisitor implements CSVProcessingVisitor  {
    protected function deleteRecord($entity, $searchParams) {
        //code to delete record here
    }
}

visitor_CSVImporterVisitor.php

<?php
abstract class CSVImporterVisitor implements CSVProcessingVisitor {
    abstract function importRecord(array $row);
}

visitor_CSVProcessingVisitor.php

<?php

interface CSVProcessingVisitor {
    public function visit(array $row);
}

visitor_CSVProcessor.php

<?php

class CSVProcessor {

    private $fileHandler;

    public function __construct(SplFileObject $file) {
        $this->fileHandler = $file;
    }

    public function process(CSVProcessingVisitor $visitor) {
        $header = null;

        while (!$this->fileHandler->eof()) {
            $row = $this->fileHandler->fgetcsv();

            if ($header === null) {
                $header = $row;
                continue;
            }

            $row = array_combine($header, $row);
            $visitor->visit($row);
        }
    }

}

visitor_run.php

<?php

$file = new SplFileObject('absence_type.csv');
$processor = new CSVProcessor($file);

// Clean things
$absenceTypeCleaner = new CSVAbsenceTypeCleaner();
$processor->process($absenceTypeCleaner);

//Import things
$absenceTypeImporter = new CSVAbsenceTypeImporter();
$processor->process($absenceTypeImporter);