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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 |
|---|---|
| 4443 | * @since 5.4.1 The `$unsanitized_postarr` parameter was added. |
| 4444 | * @since 6.0.0 The `$update` parameter was added. |
| 4445 | * |
| 4446 | * @param array $data An array of slashed, sanitized, and processed post data. |
| 4447 | * @param array $postarr An array of sanitized (and slashed) but otherwise unmodified post data. |
| 4448 | * @param array $unsanitized_postarr An array of slashed yet *unsanitized* and unprocessed post data as |
| 4449 | * originally passed to wp_insert_post(). |
| 4450 | * @param bool $update Whether this is an existing post being updated. |
| 4451 | */ |
| 4452 | $data = apply_filters( 'wp_insert_post_data', $data, $postarr, $unsanitized_postarr, $update ); |
| 4453 | } |
| 4454 | |
| 4455 | $data = wp_unslash( $data ); |
| 4456 | $where = array( 'ID' => $post_id ); |
| 4457 | |
| 4458 | if ( $update ) { |
| 4459 | /** |
| 4460 | * Fires immediately before an existing post is updated in the database. |
| 4461 | * |