'page',
'post_per_page' => count( $testimonial_slider_posts ),
'post__in' => $testimonial_slider_posts,
'orderby' =>'post__in',
);
$loop = new WP_Query($args);
if ( $loop->have_posts() ) :
$i=-1;
while ($loop->have_posts()) : $loop->the_post(); $i++;?>