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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 |
|---|---|
| 3081 | * Filter the post parent -- used to check for and prevent hierarchy loops. |
| 3082 | * |
| 3083 | * @since 3.1.0 |
| 3084 | * |
| 3085 | * @param int $post_parent Post parent ID. |
| 3086 | * @param int $post_ID Post ID. |
| 3087 | * @param array $new_postarr Array of parsed post data. |
| 3088 | * @param array $postarr Array of sanitized, but otherwise unmodified post data. |
| 3089 | */ |
| 3090 | $post_parent = apply_filters( 'wp_insert_post_parent', $post_parent, $post_ID, compact( array_keys( $postarr ) ), $postarr ); |
| 3091 | |
| 3092 | if ( isset($menu_order) ) |
| 3093 | $menu_order = (int) $menu_order; |
| 3094 | else |
| 3095 | $menu_order = 0; |
| 3096 | |
| 3097 | if ( !isset($post_password) || 'private' == $post_status ) |
| 3098 | $post_password = ''; |
| 3099 | |