array_walk closure :P

actions.class.php

	/**
	 * Outputs a CSV file for download
	 * @param sfRequest $request
	 * @return string (.csv file)
	 */
	public function executeExportcsv(sfRequest $request) {
		$companies = $this->getCompaniesData($request);

		$outstream = fopen("php://output", "w");

		$companiesArray = array();
		foreach($companies as $company) {
			$admins = $company->getColleagues(array("admin"));
			foreach($admins as $admin) {
				$companiesArray[$admin->getId()][] = $company->getDisplayName();
				$companiesArray[$admin->getId()][] = $admin->getFirstName();
				$companiesArray[$admin->getId()][] = $admin->getLastName();
				$companiesArray[$admin->getId()][] = $admin->getEmail();
			}
		}

		array_walk(&$companiesArray, function($adminArray, $companyId, $outstream) {
			fputcsv($outstream, $adminArray);
		}, $outstream);

		fclose($outstream);

		$this->getResponse()->clearHttpHeaders();
		$this->getResponse()->setStatusCode(200);
		$this->getResponse()->setContentType('text/csv');
		$this->getResponse()->setHttpHeader('Pragma', 'public'); //optional cache header
		$this->getResponse()->setHttpHeader('Expires', 0); //optional cache header
		$this->getResponse()->setHttpHeader('Content-Disposition', "attachment; filename=companies_export_" . date("m-d-Y") . ".csv");
		$this->getResponse()->setHttpHeader('Content-Transfer-Encoding', 'binary');
		$this->getResponse()->setHttpHeader('Content-Length', filesize($outstream));

		return $this->renderText(file_get_contents($outstream));
	}