PHPExcel：使用单元格中的换行符导入csv文件

I'm trying to import a csv file with PHPExcel.

Some cells contains line breaks and when using the getRowIterator method, those line breaks are seen as a new excel row.

Example :

My data :

1. "abcd"; "ab cd"; "ab{line break}cd"; "abcd";

What i get in php :

1. "abcd"; "ab cd"; "ab";
2. "cd"; "abcd";

How can i avoid that behavior ?

Thanks.