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Description

Determine whether a network is the main network of the Multisite installation.

Usage

$bool = is_main_network( $network_id );

Parameters

$network_id

( int ) optional – Optional. Network ID to test. Defaults to current network.

Returns

bool True if $network_id is the main network, or if not running Multisite.

Source

File name: wordpress/wp-includes/functions.php
Lines:

function is_main_network( $network_id = null ) {
  if ( ! is_multisite() ) {
    return true;
  }

  if ( null === $network_id ) {
    $network_id = get_current_network_id();
  }

  $network_id = (int) $network_id;

  return ( $network_id === get_main_network_id() );
}
 

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