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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 |
|---|---|
| 722 | $menu_item_value[ $key ] = implode( ' ', array_map( 'sanitize_html_class', $value ) ); |
| 723 | } |
| 724 | |
| 725 | // Apply the same filters as when calling wp_insert_post(). |
| 726 | |
| 727 | /** This filter is documented in wp-includes/post.php */ |
| 728 | $menu_item_value['title'] = wp_unslash( apply_filters( 'title_save_pre', wp_slash( $menu_item_value['title'] ) ) ); |
| 729 | |
| 730 | /** This filter is documented in wp-includes/post.php */ |
| 731 | $menu_item_value['attr_title'] = wp_unslash( apply_filters( 'excerpt_save_pre', wp_slash( $menu_item_value['attr_title'] ) ) ); |
| 732 | |
| 733 | /** This filter is documented in wp-includes/post.php */ |
| 734 | $menu_item_value['description'] = wp_unslash( apply_filters( 'content_save_pre', wp_slash( $menu_item_value['description'] ) ) ); |
| 735 | |
| 736 | if ( '' !== $menu_item_value['url'] ) { |
| 737 | $menu_item_value['url'] = sanitize_url( $menu_item_value['url'] ); |
| 738 | if ( '' === $menu_item_value['url'] ) { |
| 739 | return new WP_Error( 'invalid_url', __( 'Invalid URL.' ) ); // Fail sanitization if URL is invalid. |
| 740 | } |