What's the difference between setData() and addData()? Is there a connection if I update a product or set a new one?


setData overrides the existing data and can receive as parameter either a pair key-value either an array.
if you set as parameters a pair key-value then $_data[key] becomes value. If you set as parameter an array $_data becomes that array overwriting what ever it contained previously.

$_data = array('k1' => 'v1' , 'k2' => 'v2');

calling $obj->setData('k3','v3') results in

$_data = array('k1' => 'v1' , 'k2' => 'v2', 'k3'=>'v3');

calling $obj->setData(array('k3'=>'v3')) results in

$_data = array('k3'=>'v3');

calling $obj->setData('k2','v2000') results in

$_data = array('k1' => 'v1' , 'k2' => 'v2000')

calling $obj->setData(array('k2'=>'v2000')) results in

$_data = array('k2'=>'v2000');

addData receives as parameter only an array and it merges that array with the existing data.


$_data = array('k1' => 'v1' , 'k2' => 'v2');

calling $obj->addData(array('k3'=>'v3')) results in

$_data = array('k1' => 'v1' , 'k2' => 'v2', 'k3'=>'v3');

but calling $obj->addData(array('k2'=>'v2000')) results in

$_data = array('k1' => 'v1' , 'k2' => 'v2000');
  • what happens when we do $obj->setData('k2'=>'v2399393') then? :-) (great if you add this specific point in your answer) Apr 1 '15 at 8:11
  • @RajeevKTomy. Done.
    – Marius
    Apr 1 '15 at 8:12
  • Sorry I can upvote you only once :-) Apr 1 '15 at 8:13
  • your update is different. You skipped above specified request. I asked $obj->setData('k2'=>'v2399393') and not $obj->setData(array('k2'=>'v2000')) Apr 1 '15 at 8:16
  • 1
    @RajeevKTomy. Is this a joke?
    – Marius
    Apr 1 '15 at 8:21


function is only set one field value on one call. it can set multiple field value using multiple call of setData function.

addData() function is set multiple field values using array with array key as field index.

Just Example:

You want two field to set at object.

  • field a>Value->X
  • field b>Value->Y

If i using setData() then you need to do this type of works.need For two field you need call setData function two wise.


But if i using addData() then you can do this array key as field name



addData() and setData() are two Library Varien_Object class function.

addData() using setData() at lib file for set field value using loop.

public function addData(array $arr)
    foreach($arr as $index=>$value) {
        $this->setData($index, $value);
    return $this;
  • 4
    You can use setData to set more than one field with one call.
    – Marius
    Apr 1 '15 at 8:10
  • @Marius i have check the lib class. and you answer more clear then me
    – Amit Bera
    Apr 1 '15 at 8:26

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