Set the current worksheet as the first worksheet

Function Prototype

setCurrentSheetIsFirst(): self


$config = ['path' =>'./tests'];
$excel = new \Vtiful\Kernel\Excel($config);

$excel->fileName('hide.xlsx','sheet1') // Initialize the file and initialize the first sheet at the same time sheet1
    ->header(['sheet1'])       // insert data in sheet1 worksheet
    ->addSheet('sheet2')       // Add a new sheet sheet2, and set the current active sheet to sheet2
    ->setCurrentSheetIsFirst() // The current active sheet is sheet2, and set sheet2 as the first sheet

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