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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 |
|---|---|
| 4029 | /** |
| 4030 | * Filters whether or not to add a `__trashed` suffix to trashed posts that match the name of the updated post. |
| 4031 | * |
| 4032 | * @since 5.4.0 |
| 4033 | * |
| 4034 | * @param bool $add_trashed_suffix Whether to attempt to add the suffix. |
| 4035 | * @param string $post_name The name of the post being updated. |
| 4036 | * @param int $post_ID Post ID. |
| 4037 | */ |
| 4038 | $add_trashed_suffix = apply_filters( 'add_trashed_suffix_to_trashed_posts', true, $post_name, $post_ID ); |
| 4039 | |
| 4040 | if ( $add_trashed_suffix ) { |
| 4041 | wp_add_trashed_suffix_to_post_name_for_trashed_posts( $post_name, $post_ID ); |
| 4042 | } |
| 4043 | } |
| 4044 | |
| 4045 | // When trashing an existing post, change its slug to allow non-trashed posts to use it. |
| 4046 | if ( 'trash' === $post_status && 'trash' !== $previous_status && 'new' !== $previous_status ) { |
| 4047 | $post_name = wp_add_trashed_suffix_to_post_name_for_post( $post_ID ); |