Limit number of images in a gallery

Just wanted to share this one. I had been struggling with it for a while. Feel free to use anywhere in a theme file, replacing ### with the ID of the page with the gallery!

Code Snippet:

$posts_array = get_posts( array('post_parent' => '###', 'post_type' => 'attachment', 'numberposts' => 2) );

if ($posts_array) {
         foreach ($posts_array as $attachment) {
         	$ids .=  $attachment->ID.',';
echo do_shortcode( '[gallery link="file" id="###" size="thumbnail" include="'.$ids.'"]' ) 


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