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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.
This hook occurs 3 times in this file.
| Line | Code |
|---|---|
| 2169 | |
| 2170 | $wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->comments WHERE comment_post_ID = %d", $postid )); |
| 2171 | |
| 2172 | $wpdb->query( $wpdb->prepare( "DELETE FROM $wpdb->postmeta WHERE post_id = %d ", $postid )); |
| 2173 | |
| 2174 | if ( ! empty($meta['thumb']) ) { |
| 2175 | // Don't delete the thumb if another attachment uses it |
| 2176 | if (! $wpdb->get_row( $wpdb->prepare( "SELECT meta_id FROM $wpdb->postmeta WHERE meta_key = '_wp_attachment_metadata' AND meta_value LIKE %s AND post_id <> %d", '%'.$meta['thumb'].'%', $postid)) ) { |
| 2177 | $thumbfile = str_replace(basename($file), $meta['thumb'], $file); |
| 2178 | $thumbfile = apply_filters('wp_delete_file', $thumbfile); |
| 2179 | @ unlink($thumbfile); |
| 2180 | } |
| 2181 | } |
| 2182 | |
| 2183 | // remove intermediate images if there are any |
| 2184 | $sizes = apply_filters('intermediate_image_sizes', array('thumbnail', 'medium')); |
| 2185 | foreach ( $sizes as $size ) { |
| 2186 | if ( $intermediate = image_get_intermediate_size($postid, $size) ) { |
| 2187 | $intermediate_file = apply_filters('wp_delete_file', $intermediate['path']); |
| 2188 | @ unlink($intermediate_file); |
| 2189 | } |
| 2190 | } |
| 2191 | |
| 2192 | $file = apply_filters('wp_delete_file', $file); |
| 2193 | |
| 2194 | if ( ! empty($file) ) |
| 2195 | @ unlink($file); |
| 2196 | |
| 2197 | clean_post_cache($postid); |
| 2198 | |
| 2199 | do_action('delete_attachment', $postid); |
| 2200 | |
| 2201 | return $post; |