Import Before Row Tutorial

/*  the Excel file column with index 0 (column A) containing the CODE field is evaluated.
the $data array represents the current line of the import file and it has all
its values accessible via the Excel column index. The index starts from 0. */
$deviceCode = trim((string)$data[0]);
/*  if the column containing the attribute 'CODE' is not empty */
if($deviceCode){
    /*  	if a device with same CODE already exists
	the $deviceArray array was created with key = CODE and value = instance of the device
	in 'Before Run' area */
    if(array_key_exists($deviceCode,$deviceArray)){
        /*  the instace of the device already present, with the same code, is assigned to
	the $model object 
	$model object represents the current instance of the
	Deep_Cmdb CI model (specified in the Model field of the import configuration)*/
        $model = $deviceArray[$deviceCode];
    }
    /*  the class_id attribute is set by default to 2 (Device) */
    $model->setClassId(2);
}
else {
    /*  if 'CODE' is empty, the current model is set to null to avoid saving
    any empty or incomplete records */
    $model = null;
}