php - Math operation in yii 2 Active Query -

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is there way subtract value in int column 1?i have button when clicked call function save data in table want know how subtracting number in database using yii 2 have tried following code below had no effect. can me how make math operations in yii 2? 

public static function addsubject($subjectid, $clientid){     $subject = activecurriculum::findone(['subjectid' => $subjectid]);      $activesubject = new activesubject();     $activesubject->clientid = $clientid;     $activesubject->subjectid = $subject->subjectid;     $activesubject->subjectcode = $subject->subjectcode;     $activesubject->days = $subject->days;     $activesubject->time = $subject->time;     $activesubject->section = $subject->section;     $activesubject->room = $subject->room;     $activesubject->units = $subject->units;     $subject->units = $subject->units - 1; //this should subtract number      //of slots 1 not working.     $activesubject->save();      return true;      //return static::findone(['subjectid' => $subjectid]);                 //->where(['subjectid' => $subjectid]);    }

when made changes in ar object , want changes saved should execute ->save():

$subject->units = $subject->units - 1;  $subject->save();

looks forgot that.


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