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Wordpress Image Gallery Short Code Using Post Attachments

/ Published in: PHP
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UPDATE: might be easier or faster to use this now (also courtesy Pippin): http://pippinsplugins.com/get-all-attached-media/

**courtesy Pippin Williamson (http://pippinsplugins.com/image-gallery-short-code-using-post-attachments/)

use shortcode [photo_gallery] to display the gallery

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Copy this code and paste it in your HTML 
  1. function pippin_gallery_shortcode( $atts, $content = null ) {
  2.  
  3. 	extract( shortcode_atts( array(
  4.       'size' => ''
  5.       ), $atts ) );
  6.  
  7. 	$image_size = 'medium';
  8. 	if($size =! '') { $image_size = $size; }
  9.  
  10. 	$images = get_children(array(
  11. 		'post_parent' => get_the_ID(),
  12. 		'post_type' => 'attachment',
  13. 		'numberposts' => -1,
  14. 		'orderly' => 'menu_order',
  15. 		//'exclude' => get_post_thumbnail_id(), -- uncomment to exclude post thumbnail
  16. 		'post_mime_type' => 'image',
  17. 		)
  18. 	);
  19.  
  20. 	if($images) {
  21. 		$gallery = '<ul class="gallery clearfix">';
  22. 		foreach( $images as $image ) {
  23. 			$gallery .= '<li>';
  24. 				$gallery .= '<a href="' . wp_get_attachment_url($image->ID) . '" rel="shadowbox">';
  25. 					$gallery .= wp_get_attachment_image($image->ID, $image_size);
  26. 				$gallery .= '</a>';
  27. 			$gallery .= '</li>';
  28. 		}
  29. 		$gallery .= '</ul>';
  30.  
  31. 		return $gallery;
  32. 	}
  33.  
  34. }
  35. add_shortcode('photo_gallery', 'pippin_gallery_shortcode');

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