add_filter('the_content', 'my_addlightboxrel', 50);
function my_addlightboxrel($content) {
global $post;
$pattern ="/<a(.*?)href=('|\")(.*?).(bmp|gif|jpeg|jpg|png)('|\")(.*?)>/i";
$replacement = '<a$1href=$2$3.$4$5 rel="[gallery]" title="'.$post->post_title.'"$6>';
$content = preg_replace($pattern, $replacement, $content);
return $content;
}
add_filter( 'use_default_gallery_style', '__return_false' );
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