PHPExcel validate data for a range of cells

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I am trying to validate data for a range of cells in PHPExcel. Validating a single cell works.\[code\]$objValidation = $objPHPExcel->getActiveSheet()->getCell('A1')->getDataValidation();$objValidation->setType( PHPExcel_Cell_DataValidation::TYPE_WHOLE );$objValidation->setErrorStyle( PHPExcel_Cell_DataValidation::STYLE_STOP );$objValidation->setAllowBlank(true);$objValidation->setShowInputMessage(true);$objValidation->setShowErrorMessage(true);$objValidation->setErrorTitle('Input error');$objValidation->setError('Number is not allowed!');$objValidation->setPromptTitle('Allowed input');$objValidation->setPrompt('Only 1 and 0 are allowed.');$objValidation->setFormula1(0);$objValidation->setFormula2(1);\[/code\]I can validate other cells by creating a clone like this. \[code\]$objPHPExcel->getActiveSheet()->getCell("A2")->setDataValidation(clone $objValidation);\[/code\]But if I try to validate data through a loop, it freezes. \[code\]$j = 2;while($j <= 10){ $objPHPExcel->getActiveSheet()->getCell("A$j")->setDataValidation(clone $objValidation); }\[/code\]What am I doing wrong here?P.S. Looping works with other functions such as \[code\]getStyle()\[/code\] etc.