Save: Bitrix method

      
<?php 
//  Save()
//  /dist/bitrix/modules/bizproc/classes/general/activity.php:1049

    
public function Save()
    {
        
$usedActivities = [];
        
self::SearchUsedActivities($this$usedActivities);
        
$strUsedActivities implode(","$usedActivities);
        return 
$strUsedActivities.";".serialize($this);
    }