Exporta um array resultando de uma interação SQL em CSV

ExportCSV.php

<?php

class Controller_Newsletter extends Controller{

	public function action_export_csv()
	{
		//Return list of members Newsletter (FUELPHP)
		$newsletters = Model_Newsletter::find('all');
    		// Array of list array Newsletters 
		$listNewsletters = array(array('Nome', 'E-mail'));

		foreach ($newsletters as $newsletter) {
			array_push($listNewsletters, array(
				'name' 	=> $newsletter->name,
				'email'	=> $newsletter->email
			)); 
		}

		$filePath = DOCROOT.'files/csv/NewsletterMembers.csv';

		if(file_exists($filePath)){
			unlink($filePath);
		}
		
		$fp = fopen($filePath, 'w');
		

		foreach($listNewsletters as $list){
			fputcsv($fp, $list);
		}

		$fileName = basename($filePath);
    		$fileSize = filesize($filePath);

		header("Cache-Control: private");
    		header("Content-Type: application/stream");
    		header("Content-Length: ".$fileSize);
    		header("Content-Disposition: attachment; filename=".$fileName);

    		// Output file.
    		readfile ($filePath);   

		exit();
	}

}