WordPress Force caption on all images

add_filter( 'image_send_to_editor', 'tiny_force_caption', 100 );
function tiny_force_caption( $html ) {
  $a = strpos($html, 'caption');
  if ($a!=1) {
    preg_match('/(alignnone|alignleft|alignright|aligncenter)/', $html,$c);
    preg_match('/width="(\d*)"/', $html,$w);
    preg_match('/alt="([^"]*)"/', $html,$m);
    preg_match('/wp-image-(\d*)"/', $html,$n);
    if (!isset($n[1])) $n[1] = '0';
    $html = '[caption id="attachment_'.$n[1].'" align="'.($c?$c[1]:'alignnone').'" width="'.$w[1].'"]'.$html." © ".get_bloginfo('title')."[/caption]";
  }
  return $html;
}