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<?php
/**
 * WordPress Network Administration API.
 *
 * @package WordPress
 * @subpackage Administration
 * @since 4.4.0
 */
/**
 * Check for an existing network.
 *
 * @since 3.0.0
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @return string|false Base domain if network exists, otherwise false.
 */
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;
}
/**
 * Allow subdomain installation
 *
 * @since 3.0.0
 * @return bool Whether subdomain installation is allowed
 */
function allow_subdomain_install() {
    $domain = preg_replace( '|https?://([^/]+)|', '$1', get_option( 'home' ) );
    if ( parse_url( get_option( 'home' ), PHP_URL_PATH ) || 'localhost' === $domain || preg_match( '|^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+$|', $domain ) ) {
        return false;
    }
    return true;
}
/**
 * Allow subdirectory installation.
 
 
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