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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 |
|---|---|
| 254 | if ( isset($attachment['post_content']) ) |
| 255 | $post['post_content'] = $attachment['post_content']; |
| 256 | if ( isset($attachment['post_title']) ) |
| 257 | $post['post_title'] = $attachment['post_title']; |
| 258 | if ( isset($attachment['post_excerpt']) ) |
| 259 | $post['post_excerpt'] = $attachment['post_excerpt']; |
| 260 | if ( isset($attachment['menu_order']) ) |
| 261 | $post['menu_order'] = $attachment['menu_order']; |
| 262 | |
| 263 | $post = apply_filters('attachment_fields_to_save', $post, $attachment); |
| 264 | |
| 265 | if ( isset($post['errors']) ) { |
| 266 | $errors[$attachment_id] = $post['errors']; |
| 267 | unset($post['errors']); |
| 268 | } |
| 269 | |
| 270 | if ( $post != $_post ) |
| 271 | wp_update_post($post); |
| 272 | |