$objPHPExcel->getActiveSheet()->getColumnDimension('B')->setAutoSize(true);
$objPHPExcel->getActiveSheet()->getColumnDimension('D')->setWidth(12);
Example:
//Can't use column index
$column_codes = array('A', 'B', 'C', 'D', 'E', 'F', 'G', 'H');
foreach($column_codes as $value){
$worksheet->getColumnDimension($value)->setAutoSize(true);
}
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