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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 |
|---|---|
| 3133 | * Filter the post parent -- used to check for and prevent hierarchy loops. |
| 3134 | * |
| 3135 | * @since 3.1.0 |
| 3136 | * |
| 3137 | * @param int $post_parent Post parent ID. |
| 3138 | * @param int $post_ID Post ID. |
| 3139 | * @param array $new_postarr Array of parsed post data. |
| 3140 | * @param array $postarr Array of sanitized, but otherwise unmodified post data. |
| 3141 | */ |
| 3142 | $post_parent = apply_filters( 'wp_insert_post_parent', $post_parent, $post_ID, compact( array_keys( $postarr ) ), $postarr ); |
| 3143 | |
| 3144 | $post_name = wp_unique_post_slug( $post_name, $post_ID, $post_status, $post_type, $post_parent ); |
| 3145 | |
| 3146 | // Don't unslash. |
| 3147 | $post_mime_type = isset( $postarr['post_mime_type'] ) ? $postarr['post_mime_type'] : ''; |
| 3148 | |
| 3149 | // Expected_slashed (everything!). |
| 3150 | $data = compact( 'post_author', 'post_date', 'post_date_gmt', 'post_content', 'post_content_filtered', 'post_title', 'post_excerpt', 'post_status', 'post_type', 'comment_status', 'ping_status', 'post_password', 'post_name', 'to_ping', 'pinged', 'post_modified', 'post_modified_gmt', 'post_parent', 'menu_order', 'post_mime_type', 'guid' ); |
| 3151 | |