función que permite exportar un array y exportarlo a un archivo CSV

arrayToCsv.php

<?php

/*
*       @fuente: http://stackoverflow.com/a/16251849
*/
function generateFile($datos, $filename = "export.csv", $delimiter=";") {
        $f = fopen("/tmp/$filename", 'w');
        // loop over the input array
        foreach ($datos as $line) {
            // generate csv lines from the inner arrays
            fputcsv($f, $line, $delimiter);
        }
        // reset the file pointer to the start of the file
        fseek($f, 0);
        // tell the browser it's going to be a csv file
        header('Content-Type: application/csv');
        // tell the browser we want to save it instead of displaying it
        header('Content-Disposition: attachment; filename="'.$filename.'";');
        // make php send the generated csv lines to the browser
        fpassthru($f);
}