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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 1234 | $thumbnail_html = wp_get_attachment_image( $thumbnail_id, 'post-thumbnail' ); |
| 1235 | if ( !empty( $thumbnail_html ) ) { |
| 1236 | $ajax_nonce = wp_create_nonce( "set_post_thumbnail-$post_ID" ); |
| 1237 | $content = sprintf($set_thumbnail_link, $thumbnail_html); |
| 1238 | $content .= '<p class="hide-if-no-js"><a href="#" id="remove-post-thumbnail" onclick="WPRemoveThumbnail(\'' . $ajax_nonce . '\');return false;">' . esc_html__( 'Remove featured image' ) . '</a></p>'; |
| 1239 | } |
| 1240 | $content_width = $old_content_width; |
| 1241 | } |
| 1242 | |
| 1243 | return apply_filters( 'admin_post_thumbnail_html', $content ); |
| 1244 | } |
| 1245 | |
| 1246 | /** |
| 1247 | * Check to see if the post is currently being edited by another user. |
| 1248 | * |
| 1249 | * @since 2.5.0 |
| 1250 | * |
| 1251 | * @param int $post_id ID of the post to check for editing |
| 1252 | * @return bool|int False: not locked or locked by current user. Int: user ID of user with lock. |