function not call on the right html tag

Question

I have a function like that

function get_file_size()
{
    $size = '';
        if (get_field('size') && get_field('megabyte')) :
            $size = the_field('size');
            the_field('megabyte');
        endif;
    return $size;  //it return 20mb
}

my problem comes when I want to call the above function in theme.

        $size_link = get_file_size();
        $output = sprintf(
            '<span class="%1$s">%2$s</span>',
            esc_attr(join(' ', $classes)),
            $size_link
        );

the above code return

20mb20mb
<span></span>

by the way, when I try to like this

    $output = sprintf(
        '<span class="%1$s">%2$s</span>',
        esc_attr(join(' ', $classes)),
       get_file_size()
    );

nothing print!

Answer 1

It's because the_field in your get_file_size method prints the value, change these to get_field instead.