Color of first word in WordPress content

gistfile1.txt

add_filter('the_content', 'set_first_word_color', 10);

function set_first_word_color( $content )
{
    $color = '#FF0000';

    $pos = strpos(ltrim($content), ' ');

    $new_content = '<span style="color: '.$color.'"'.substr($content, 0, $pos).'</span>'.substr($content, $pos);

    return $new_content;
}