How to check if an image attachment is the post thumbnail

  • Resolved silafu

    (@silafu)


    13 years, 9 months ago

    I’m trying to accomplish something like this:

    <ul>
<li class="post-thumbnail"><img src="...></li>
<li><img src="...></li>
<li><img src="...></li>
<li><img src="...></li>
</ul>

    How can I tell if an image in a post’s gallery is set as post thumbnail?

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  • Thread Starter silafu

    (@silafu)

    Found the solution 

    function nerdy_get_images($size = 'thumbnail', $limit = '0', $offset = '0') {
	global $post;

	$images = get_children( array('post_parent' => $post->ID, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => 'ASC', 'orderby' => 'menu_order ID') );

	if ($images) {

		$num_of_images = count($images);

		if ($offset > 0) : $start = $offset--; else : $start = 0; endif;
		if ($limit > 0) : $stop = $limit+$start; else : $stop = $num_of_images; endif;

		$i = 0;
		echo '<ul>';
		foreach ($images as $image) {
			if ($start <= $i and $i < $stop) {
			$img_title = $image->post_title;   // title.
			$img_description = $image->post_content; // description.
			$img_caption = $image->post_excerpt; // caption.
			$img_url = wp_get_attachment_url($image->ID); // url of the full size image.
			$img_url_large = wp_get_attachment_url($image->ID, 'medium'); // url of the full size image.
			$preview_array = image_downsize( $image->ID, $size );
 			$img_preview = $preview_array[0]; // thumbnail or medium image to use for preview.
			$thumb_id = get_post_thumbnail_id(get_the_ID());

 			///////////////////////////////////////////////////////////
			// This is where you'd create your custom image/link/whatever tag using the variables above.
			// This is an example of a basic image tag using this method.
			?>

			<li<?php if ($thumb_id == $image->ID) {echo ' class="main-image"';}?> ><a href="<?php echo $img_url_large; ?>"><img src="<?php echo $img_preview; ?>" alt="<?php echo $img_caption; ?>" title="<?php echo $img_title; ?>"></a></li>

			<?
			// End custom image tag. Do not edit below here.
			///////////////////////////////////////////////////////////

			}
			$i++;
		}
echo '</ul>';
	}
}
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