Defined (1)

The function is defined in the following location(s).

/wp-admin/includes/upgrade.php  

function upgrade_450() { 
    global $wp_current_db_version, $wpdb; 
 
    if ( $wp_current_db_version < 36180 ) { 
        wp_clear_scheduled_hook( 'wp_maybe_auto_update' ); 
    } 
 
    // Remove unused email confirmation options, moved to usermeta. 
    if ( $wp_current_db_version < 36679 && is_multisite() ) { 
        $wpdb->query( "DELETE FROM $wpdb->options WHERE option_name REGEXP '^[0-9]+_new_email$'" ); 
    } 
 
    // Remove unused user setting for wpLink. 
    delete_user_setting( 'wplink' ); 
}