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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 |
---|---|
441 | $post['post_excerpt'] = $attachment['post_excerpt']; |
442 | if ( isset($attachment['menu_order']) ) |
443 | $post['menu_order'] = $attachment['menu_order']; |
444 |
|
445 | if ( isset($send_id) && $attachment_id == $send_id ) { |
446 | if ( isset($attachment['post_parent']) ) |
447 | $post['post_parent'] = $attachment['post_parent']; |
448 | } |
449 |
|
450 | $post = apply_filters('attachment_fields_to_save', $post, $attachment); |
451 |
|
452 | if ( isset($attachment['image_alt']) ) { |
453 | $image_alt = get_post_meta($attachment_id, '_wp_attachment_image_alt', true); |
454 | if ( $image_alt != stripslashes($attachment['image_alt']) ) { |
455 | $image_alt = wp_strip_all_tags( stripslashes($attachment['image_alt']), true ); |
456 | // update_meta expects slashed |
457 | update_post_meta( $attachment_id, '_wp_attachment_image_alt', addslashes($image_alt) ); |
458 | } |
459 | } |