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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 |
|---|---|
| 4981 | |
| 4982 | /** |
| 4983 | * Filters whether the post slug would make a bad attachment slug. |
| 4984 | * |
| 4985 | * @since 3.1.0 |
| 4986 | * |
| 4987 | * @param bool $bad_slug Whether the slug would be bad as an attachment slug. |
| 4988 | * @param string $slug The post slug. |
| 4989 | */ |
| 4990 | $is_bad_attachment_slug = apply_filters( 'wp_unique_post_slug_is_bad_attachment_slug', false, $slug ); |
| 4991 | |
| 4992 | if ( $post_name_check |
| 4993 | || in_array( $slug, $feeds, true ) || 'embed' === $slug |
| 4994 | || $is_bad_attachment_slug |
| 4995 | ) { |
| 4996 | $suffix = 2; |
| 4997 | do { |
| 4998 | $alt_post_name = _truncate_post_slug( $slug, 200 - ( strlen( $suffix ) + 1 ) ) . "-$suffix"; |
| 4999 | $post_name_check = $wpdb->get_var( $wpdb->prepare( $check_sql, $alt_post_name, $post_ID ) ); |