获取主网络ID。

原型

get_main_network_id()

返回值

(int)  主网络的ID。

源文件

路径:wp-includes/functions.php

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<?php
...
function get_main_network_id() {
	if ( ! is_multisite() ) {
		return 1;
	}

	$current_network = get_network();

	if ( defined( 'PRIMARY_NETWORK_ID' ) ) {
		$main_network_id = PRIMARY_NETWORK_ID;
	} elseif ( isset( $current_network->id ) && 1 === (int) $current_network->id ) {
		// If the current network has an ID of 1, assume it is the main network.
		$main_network_id = 1;
	} else {
		$_networks = get_networks( array( 'fields' => 'ids', 'number' => 1 ) );
		$main_network_id = array_shift( $_networks );
	}

	/**
	 * Filters the main network ID.
	 *
	 * @since 4.3.0
	 *
	 * @param int $main_network_id The ID of the main network.
	 */
	return (int) apply_filters( 'get_main_network_id', $main_network_id );
}

...
?>

其他

英文文档:https://developer.wordpress.org/reference/functions/get_main_network_id/