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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 |
|---|---|
| 1735 | * @param string $post_type |
| 1736 | * @param integer $post_parent |
| 1737 | * @return string unique slug for the post, based on $post_name (with a -1, -2, etc. suffix) |
| 1738 | */ |
| 1739 | function wp_unique_post_slug($slug, $post_ID, $post_status, $post_type, $post_parent) { |
| 1740 | if ( in_array( $post_status, array( 'draft', 'pending' ) ) ) |
| 1741 | return $slug; |
| 1742 | |
| 1743 | global $wpdb, $wp_rewrite; |
| 1744 | $hierarchical_post_types = apply_filters('hierarchical_post_types', array('page')); |
| 1745 | if ( 'attachment' == $post_type ) { |
| 1746 | // Attachment slugs must be unique across all types. |
| 1747 | $check_sql = "SELECT post_name FROM $wpdb->posts WHERE post_name = %s AND ID != %d LIMIT 1"; |
| 1748 | $post_name_check = $wpdb->get_var($wpdb->prepare($check_sql, $slug, $post_ID)); |
| 1749 | |
| 1750 | if ( $post_name_check || in_array($slug, $wp_rewrite->feeds) ) { |
| 1751 | $suffix = 2; |
| 1752 | do { |
| 1753 | $alt_post_name = substr($slug, 0, 200-(strlen($suffix)+1)). "-$suffix"; |