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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 |
|---|---|
| 4522 | /** |
| 4523 | * Filter attachment post data before it is updated in or added |
| 4524 | * to the database. |
| 4525 | * |
| 4526 | * @since 3.9.0 |
| 4527 | * |
| 4528 | * @param array $data Array of sanitized attachment post data. |
| 4529 | * @param array $object Array of un-sanitized attachment post data. |
| 4530 | */ |
| 4531 | $data = apply_filters( 'wp_insert_attachment_data', $data, $object ); |
| 4532 | $data = wp_unslash( $data ); |
| 4533 | |
| 4534 | if ( $update ) { |
| 4535 | $wpdb->update( $wpdb->posts, $data, array( 'ID' => $post_ID ) ); |
| 4536 | } else { |
| 4537 | // If there is a suggested ID, use it if not already present |
| 4538 | if ( !empty($import_id) ) { |
| 4539 | $import_id = (int) $import_id; |
| 4540 | if ( ! $wpdb->get_var( $wpdb->prepare("SELECT ID FROM $wpdb->posts WHERE ID = %d", $import_id) ) ) { |