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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 |
|---|---|
| 96 | |
| 97 | /** |
| 98 | * Fires when a site's initialization routine should be executed. |
| 99 | * |
| 100 | * @since 5.1.0 |
| 101 | * |
| 102 | * @param WP_Site $new_site New site object. |
| 103 | * @param array $args Arguments for the initialization. |
| 104 | */ |
| 105 | do_action( 'wp_initialize_site', $new_site, $args ); |
| 106 | |
| 107 | // Only compute extra hook parameters if the deprecated hook is actually in use. |
| 108 | if ( has_action( 'wpmu_new_blog' ) ) { |
| 109 | $user_id = ! empty( $args['user_id'] ) ? $args['user_id'] : 0; |
| 110 | $meta = ! empty( $args['options'] ) ? $args['options'] : array(); |
| 111 | |
| 112 | // WPLANG was passed with `$meta` to the `wpmu_new_blog` hook prior to 5.1.0. |
| 113 | if ( ! array_key_exists( 'WPLANG', $meta ) ) { |
| 114 | $meta['WPLANG'] = get_network_option( $new_site->network_id, 'WPLANG' ); |