The RdnCsv ZF2 module makes it really easy to export and import CSV files.

1. Use composer to require the radnan/rdn-csv package:

   $ composer require radnan/rdn-csv:1.*

2. Activate the module by including it in your application.config.php file:

   <?php
   
   return array(
       'modules' => array(
           'RdnCsv',
           // ...
       ),
   );

The module comes with two plugins - csvExport() and csvImport().

Export data into a downloadable CSV file using this plugin.

// inside a controller action

$header = array(
	'Year',
	'Make',
	'Model',
	'Description',
	'Price',
);
$records = array(
	array(
		'1997',
		'Ford',
		'E350',
		'ac, abs, moon',
		'3000.00',
	),
);

return $this->csvExport('foo.csv', $header, $records);

The plugin will return a response object which you can then return from your controller action.

Read more documentation on csvExport()

Import data from a CSV file using this plugin.

// inside a controller action

$csv = $this->csvImport('/path/to/foo.csv');

foreach ($csv as $row)
{
	var_dump($row);
	// array(
	//     'Year' => '1997',
	//     'Make' => 'Ford',
	//     'Model' => 'E350',
	//     'Description' => 'ac, abs, moon',
	//     'Price' => '3000.00',
	// )
}

The plugin returns an iterator that can be used to loop over all the rows in the CSV file.

Read more documentation on csvImport()