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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 |
|---|---|
| 3210 | * Filters the post parent -- used to check for and prevent hierarchy loops. |
| 3211 | * |
| 3212 | * @since 3.1.0 |
| 3213 | * |
| 3214 | * @param int $post_parent Post parent ID. |
| 3215 | * @param int $post_ID Post ID. |
| 3216 | * @param array $new_postarr Array of parsed post data. |
| 3217 | * @param array $postarr Array of sanitized, but otherwise unmodified post data. |
| 3218 | */ |
| 3219 | $post_parent = apply_filters( 'wp_insert_post_parent', $post_parent, $post_ID, compact( array_keys( $postarr ) ), $postarr ); |
| 3220 | |
| 3221 | /* |
| 3222 | * If the post is being untrashed and it has a desired slug stored in post meta, |
| 3223 | * reassign it. |
| 3224 | */ |
| 3225 | if ( 'trash' === $previous_status && 'trash' !== $post_status ) { |
| 3226 | $desired_post_slug = get_post_meta( $post_ID, '_wp_desired_post_slug', true ); |
| 3227 | if ( $desired_post_slug ) { |
| 3228 | delete_post_meta( $post_ID, '_wp_desired_post_slug' ); |