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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 |
|---|---|
| 493 | * |
| 494 | * @since 5.1.0 |
| 495 | * |
| 496 | * @param WP_Error $errors Error object to add validation errors to. |
| 497 | * @param array $data Associative array of complete site data. See {@see wp_insert_site()} |
| 498 | * for the included data. |
| 499 | * @param WP_Site|null $old_site The old site object if the data belongs to a site being updated, |
| 500 | * or null if it is a new site being inserted. |
| 501 | */ |
| 502 | do_action( 'wp_validate_site_data', $errors, $data, $old_site ); |
| 503 | |
| 504 | if ( ! empty( $errors->errors ) ) { |
| 505 | return $errors; |
| 506 | } |
| 507 | |
| 508 | // Prepare for database. |
| 509 | $data['site_id'] = $data['network_id']; |
| 510 | unset( $data['network_id'] ); |
| 511 | |