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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 |
|---|---|
| 3688 | |
| 3689 | /** |
| 3690 | * Filters whether the post slug would make a bad attachment slug. |
| 3691 | * |
| 3692 | * @since 3.1.0 |
| 3693 | * |
| 3694 | * @param bool $bad_slug Whether the slug would be bad as an attachment slug. |
| 3695 | * @param string $slug The post slug. |
| 3696 | */ |
| 3697 | if ( $post_name_check || in_array( $slug, $feeds ) || 'embed' === $slug || apply_filters( 'wp_unique_post_slug_is_bad_attachment_slug', false, $slug ) ) { |
| 3698 | $suffix = 2; |
| 3699 | do { |
| 3700 | $alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix"; |
| 3701 | $post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_ID ) ); |
| 3702 | $suffix++; |
| 3703 | } while ( $post_name_check ); |
| 3704 | $slug = $alt_post_name; |
| 3705 | } |
| 3706 | } elseif ( is_post_type_hierarchical( $post_type ) ) { |