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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 |
|---|---|
| 458 | $post['post_excerpt'] = $attachment['post_excerpt']; |
| 459 | if ( isset($attachment['menu_order']) ) |
| 460 | $post['menu_order'] = $attachment['menu_order']; |
| 461 | |
| 462 | if ( isset($send_id) && $attachment_id == $send_id ) { |
| 463 | if ( isset($attachment['post_parent']) ) |
| 464 | $post['post_parent'] = $attachment['post_parent']; |
| 465 | } |
| 466 | |
| 467 | $post = apply_filters('attachment_fields_to_save', $post, $attachment); |
| 468 | |
| 469 | if ( isset($attachment['image_alt']) ) { |
| 470 | $image_alt = get_post_meta($attachment_id, '_wp_attachment_image_alt', true); |
| 471 | if ( $image_alt != stripslashes($attachment['image_alt']) ) { |
| 472 | $image_alt = wp_strip_all_tags( stripslashes($attachment['image_alt']), true ); |
| 473 | // update_meta expects slashed |
| 474 | update_post_meta( $attachment_id, '_wp_attachment_image_alt', addslashes($image_alt) ); |
| 475 | } |
| 476 | } |