如何通过标题获取单元格值？ 不是数字索引（phpexcel）

In the current version of my project, I can only get a cell value using getCell("A4")->getValue(), but there's a problem, sometime I want to delete or add a column, it will disrupt other values, so I have to sort my data again. I want to know if there is a function, that can give me cell using using a number as a column insted of a letter, exemple: "A4" from $title['first'][4], and "B5" from $title['second'][5] image of exemple

Maybe my expression is not clear enough,I hope you can get my point/question, thanks!

$colunmn=1; //The colunmn  you want to start the cicle 
$columnMax=5; //The colunmn  you want to end the cicle 
while($coluna < $columnMax){
    $colunmString = PHPExcel_Cell::stringFromColumnIndex($colunmn); //Convert the nº index into a collunm string ex: 1->'A', 2->'B', 27->'AA', 28->'AB'
    getCell($colunmString. "2")->getValue(); //I used "2" as a line exemple you can change it
    $colunmString++;
}

You can adapt that code to your needs. Just use the function PHPExcel_Cell::stringFromColumnIndex( int ) to get the column string with an int index.