<?php

header('Content-Encoding: UTF-8');
header('Content-type: text/csv; charset=UTF-8');
echo "\xEF\xBB\xBF";

// Loop through the data array
foreach ( $data as $row ) {
    // Loop through every value in a row
    foreach ( $row[$model] as &$value ) {
        // Apply opening and closing text delimiters to every value
        $value = '"' . $value . '"';
    }
    // Echo all values in a row comma separated
    echo implode(',', $row[$model]) . "\r\n";
}