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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 |
|---|---|
| 2841 | if ( ! is_array( $feeds ) ) |
| 2842 | $feeds = array(); |
| 2843 | |
| 2844 | $hierarchical_post_types = get_post_types( array('hierarchical' => true) ); |
| 2845 | if ( 'attachment' == $post_type ) { |
| 2846 | // Attachment slugs must be unique across all types. |
| 2847 | $check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND ID != %d LIMIT 1"; |
| 2848 | $post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $slug, $post_ID ) ); |
| 2849 | |
| 2850 | if ( $post_name_check || in_array( $slug, $feeds ) || apply_filters( 'wp_unique_post_slug_is_bad_attachment_slug', false, $slug ) ) { |
| 2851 | $suffix = 2; |
| 2852 | do { |
| 2853 | $alt_post_name = substr ($slug, 0, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix"; |
| 2854 | $post_name_check = $wpdb->get_var( $wpdb->prepare($check_sql, $alt_post_name, $post_ID ) ); |
| 2855 | $suffix++; |
| 2856 | } while ( $post_name_check ); |
| 2857 | $slug = $alt_post_name; |
| 2858 | } |
| 2859 | } elseif ( in_array( $post_type, $hierarchical_post_types ) ) { |