Takes an array of data and create a csv file that will automatically download

downloadable-csv.php

<?php

/**
 * Takes an array of data and creates a csv file that will automatically download
 */
function downloadable_csv( $data, $filename = 'data_csv' ){
    /*
        Sample Data Format:
            array(
                'headings' => array(),
                'data' => array(
                    array()
                )
            );
     */
    
    header('Content-Type: text/csv; charset=utf-8');
    header('Content-Disposition: attachment; filename='.$filename.'.csv');

    // Create a file pointer connected to the output stream
    $output = fopen('php://output', 'w');

    // Output the column headings
    fputcsv($output, $data['headings']);

    // Loop over the rows, outputting them
    foreach( $data['data'] as $row ){
        fputcsv($output, $row, ',', '"');
    }
}