network_domain_check()

Check for an existing network.

Return

(Whether) a network exists.

Source

File: wp-admin/includes/network.php 

function network_domain_check() {
	global $wpdb;

	$sql = $wpdb->prepare( "SHOW TABLES LIKE %s", $wpdb->esc_like( $wpdb->site ) );
	if ( $wpdb->get_var( $sql ) ) {
		return $wpdb->get_var( "SELECT domain FROM $wpdb->site ORDER BY id ASC LIMIT 1" );
	}
	return false;
}

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Related

Uses

Uses
Uses Description
wp-includes/wp-db.php: wpdb::prepare()

Prepares a SQL query for safe execution. Uses sprintf()-like syntax.
wp-includes/wp-db.php: wpdb::esc_like()

First half of escaping for LIKE special characters % and _ before preparing for MySQL.
wp-includes/wp-db.php: wpdb::get_var()

Retrieve one variable from the database.

Used By

Used By
Used By Description
wp-admin/includes/network.php: get_clean_basedomain()

Get base domain of network.

Changelog

Changelog
Version Description
WP-3.0.0 Introduced.