The cells works like array, when: A=0, B=1, C=2..., etc. The rows init on 1, like excel.
#Create
$excel = new Excel('COMPANY NAME');
#Add text to cell
setValue($cell, $row, $value)
$excel->setValue(1, 1, "Event");
Add word "Event" on B:1
#Merge
$excel->merge(1,1, 3, true);
#Background Cell
$excel->backgroundCell("#fff000", 1,1);
#Download
$excel->download('fileName');
#Save
If you need store excel data in a variable
$data = $excel->save();
#Full Example
$excel = new Excel('EyCopia');
$excel->merge(1,1, 3, true);
$excel->setValue(1, 1, "Event");
$excel->backgroundCell("#fff000", 1,1);
$excel->setValue(0, 2, "Days", true);
$excel->setValue(1, 2, "Monday", true);
$excel->setValue(2, 2, "Tuesday", true);
$excel->setValue(3, 2, "Wednesday", true);
$excel->setValue(0, 3, "Hackaton", true)
->setValue(1, 3, "12", true)
->setValue(2, 3, "34", true)
->setValue(3, 3, "15", true);
$excel->setValue(0,4, "Networking", true)
->setValue(1,4, "10", true)
->setValue(2,4, "12", true)
->setValue(3,4, "43", true);
$excel->download('juan');