模拟alt+enter在计算单元CSV输出中创建从PHP到Excel的新行

I'm generating a CSV file using PHP and opening it in Excel. Adding "\n" at the end of each record creates a new line and works perfectly, however I need to figure out a way to create a newline within a cell itself. The same functionality that alt+enter achieves when entering data manually into Excel. Does anyone have any insight as to how this can be performed? I have tried "\n\r", "\n", chr(10), none of which seem to work, just keep getting a complete new line instead of newline within the same cell.I'm generating a CSV file using PHP and opening