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<title>[35022] trunk/src/wp-admin/includes/post.php: Media: Introduce the `admin_post_thumbnail_size` filter, which enables manipulation of the image size used to display the post thumbnail in the 'Featured Image' meta box.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/35022">35022</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/35022","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>DrewAPicture</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2015-10-11 16:53:35 +0000 (Sun, 11 Oct 2015)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Media: Introduce the `admin_post_thumbnail_size` filter, which enables manipulation of the image size used to display the post thumbnail in the 'Featured Image' meta box.
This filter has no effect on the image size used to display post thumbnails on the front-end.
Props dboulet, DrewAPicture.
Fixes <a href="https://core.trac.wordpress.org/ticket/28512">#28512</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpadminincludespostphp">trunk/src/wp-admin/includes/post.php</a></li>
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<h3>Diff</h3>
<a id="trunksrcwpadminincludespostphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-admin/includes/post.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-admin/includes/post.php 2015-10-11 03:33:50 UTC (rev 35021)
+++ trunk/src/wp-admin/includes/post.php 2015-10-11 16:53:35 UTC (rev 35022)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -1396,10 +1396,31 @@
</span><span class="cx" style="display: block; padding: 0 10px"> if ( $thumbnail_id && get_post( $thumbnail_id ) ) {
</span><span class="cx" style="display: block; padding: 0 10px"> $old_content_width = $content_width;
</span><span class="cx" style="display: block; padding: 0 10px"> $content_width = 266;
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- if ( !isset( $_wp_additional_image_sizes['post-thumbnail'] ) )
- $thumbnail_html = wp_get_attachment_image( $thumbnail_id, array( $content_width, $content_width ) );
- else
- $thumbnail_html = wp_get_attachment_image( $thumbnail_id, 'post-thumbnail' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+ $size = isset( $_wp_additional_image_sizes['post-thumbnail'] ) ? 'post-thumbnail' : array( $content_width, $content_width );
+
+ /**
+ * Filter the size used to display the post thumbnail image in the 'Featured Image' meta box.
+ *
+ * Note: When a theme adds 'post-thumbnail' support, a special 'post-thumbnail'
+ * image size is registered, which differs from the 'thumbnail' image size
+ * managed via the Settings > Media screen. See the `$size` parameter description
+ * for more information on default values.
+ *
+ * @since 4.4.0
+ *
+ * @param string|array $size Post thumbnail image size to display in the meta box. Accepts
+ * any valid image size, or an array of height and width values.
+ * If the 'post-thumbnail' size is set, default is 'post-thumbnail'.
+ * Otherwise, default is an array with `$content_width` as the
+ * height and width values.
+ * @param int $thumbnail_id Post thumbnail attachment ID.
+ * @param WP_Post $post The post object associated with the thumbnail.
+ */
+ $size = apply_filters( 'admin_post_thumbnail_size', $size, $thumbnail_id, $post );
+
+ $thumbnail_html = wp_get_attachment_image( $thumbnail_id, $size );
+
</ins><span class="cx" style="display: block; padding: 0 10px"> if ( !empty( $thumbnail_html ) ) {
</span><span class="cx" style="display: block; padding: 0 10px"> $ajax_nonce = wp_create_nonce( 'set_post_thumbnail-' . $post->ID );
</span><span class="cx" style="display: block; padding: 0 10px"> $content = sprintf( $set_thumbnail_link,
</span></span></pre>
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