Create csv file with php

 $fileName = "contact-list-" . date('Y-m-d') . ".xls";
                ob_end_clean();

                $fields = array('ID', 'Name', 'Email', 'Phone', 'Request For', 'Job Address', 'Work Type', 'About Job', 'Created At');
                // $output = fopen('php://output', 'w');
                // fputcsv($output,  $fields);
                $excelData = implode("\t", array_values($fields)) . "\n";
                function filterData(&$str){ 
                    $str = preg_replace("/\t/", "\\t", $str); 
                    $str = preg_replace("/\r?\n/", "\\n", $str); 
                    if(strstr($str, '"')) $str = '"' . str_replace('"', '""', $str) . '"'; 
                } 
                foreach ($all_data as $single_data) {
                    $lineData = array($single_data['id'], $single_data['cus_fname'], $single_data['cus_email'], $single_data['cus_phone'], $single_data['cus_request_for'], $single_data['cus_job_address'], $single_data['cus_work_type'], $single_data['cus_about_job'], $single_data['created_at']);
                    array_walk($lineData, 'filterData'); 
                    $excelData .= implode("\t", array_values($lineData)) . "\n"; 

                }
                header('Content-Type: text/csv; charset=utf-8');
                header("Content-Type:application/octet-stream");
                header('Content-Disposition: attachment; filename=' . $fileName);
                // fclose($output);
                echo $excelData;