Export php array to CSV
CSV (comma-separated values) is the most widely supported format for transferring tabular data. Exporting data in CSV format is very common in web applications. This simple example will help you get started with CSV and PHP. The main goal is to create a simple way to export data from your website or web application into a CSV that can be downloaded by the user.

    $data = array(
        array('name' => 'A', 'mail' => 'a@gmail.com', 'age' => 43),
        array('name' => 'C', 'mail' => 'c@gmail.com', 'age' => 24),
        array('name' => 'B', 'mail' => 'b@gmail.com', 'age' => 35),
        array('name' => 'G', 'mail' => 'f@gmail.com', 'age' => 22),
        array('name' => 'F', 'mail' => 'd@gmail.com', 'age' => 52),
        array('name' => 'D', 'mail' => 'g@gmail.com', 'age' => 32),
        array('name' => 'E', 'mail' => 'e@gmail.com', 'age' => 34),
        array('name' => 'K', 'mail' => 'j@gmail.com', 'age' => 18),
        array('name' => 'L', 'mail' => 'h@gmail.com', 'age' => 25),
        array('name' => 'H', 'mail' => 'i@gmail.com', 'age' => 28),
        array('name' => 'J', 'mail' => 'j@gmail.com', 'age' => 53),
        array('name' => 'I', 'mail' => 'l@gmail.com', 'age' => 26),
    );

$fileName_1 = 'Manifest.csv';
        header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
        header('Content-Description: File Transfer');
        header("Content-type: text/csv");
        header("Content-Disposition: attachment; filename={$fileName_1}");
        header("Expires: 0");
        header("Pragma: public");
        $fh1 = @fopen( 'php://output', 'w' );
        $headerDisplayed1 = false;

        foreach ( $data as $data1 ) {
            // Add a header row if it hasn't been added yet
            if ( !$headerDisplayed1 ) {
                // Use the keys from $data as the titles
                fputcsv($fh1, array_keys($data1));
                $headerDisplayed1 = true;
            }

            // Put the data into the stream
            fputcsv($fh1, $data1);
        }
    // Close the file
        fclose($fh1);
    // Make sure nothing else is sent, our file is done
        exit;