Questions about phpexcel

You can run phpexcel locally. It is okay to export the excel file, but it does not respond after it is deployed on the server. I have logged out on the Internet like // require_once & nbsp; PHPEXCEL_ROOT & nbsp ;. & nbsp; 'phpexcel/Shared/ZipStreamWrapper. php '; does not work either. The following is the export code. For more information, see phpexcel.
Run locally. It is okay to export the excel file, but it does not respond when it is deployed on the server. I have logged out the file on the internet and read it like // require_once PHPEXCEL_ROOT. 'phpexcel/Shared/ZipStreamWrapper. php '; does not work either. The following is the export code. thank you for your comments:

// Export data in excel
Function excel (){
Require_once './Classes/PHPExcel. php ';
Require_once './Classes/PHPExcel/IOFactory. php ';
$ U = D ('clients ');
$ Data = $ _ SESSION ['datas'];

$ ObjPHPExcel = new PHPExcel ();
// Set properties
$ ObjPHPExcel-> getProperties ()-> setCreator ("ctos ")
-> SetLastModifiedBy ("ctos ")
-> SetTitle ("Office 2007 XLSX Test Document ")
-> SetSubject ("Office 2007 XLSX Test Document ")
-> SetDescription ("Test document for Office 2007 XLSX, generated using PHP classes .")
-> SetKeywords ("office 2007 openxml php ")
-> SetCategory ("Test result file ");

// Set width
$ ObjPHPExcel-> getActiveSheet ()-> getColumnDimension ('A')-> setWidth (8 );
$ ObjPHPExcel-> getActiveSheet ()-> getColumnDimension ('B')-> setWidth (10 );
$ ObjPHPExcel-> getActiveSheet ()-> getColumnDimension ('C')-> setWidth (25 );
$ ObjPHPExcel-> getActiveSheet ()-> getColumnDimension ('D')-> setWidth (12 );
$ ObjPHPExcel-> getActiveSheet ()-> getColumnDimension ('e')-> setWidth (50 );
$ ObjPHPExcel-> getActiveSheet ()-> getColumnDimension ('F')-> setWidth (10 );
$ ObjPHPExcel-> getActiveSheet ()-> getColumnDimension ('g')-> setWidth (12 );
$ ObjPHPExcel-> getActiveSheet ()-> getColumnDimension ('h')-> setWidth (12 );
$ ObjPHPExcel-> getActiveSheet ()-> getColumnDimension ('I')-> setWidth (12 );
$ ObjPHPExcel-> getActiveSheet ()-> getColumnDimension ('J')-> setWidth (30 );

// Set the row height
$ ObjPHPExcel-> getActiveSheet ()-> getRowDimension ('1')-> setRowHeight (22 );

$ ObjPHPExcel-> getActiveSheet ()-> getRowDimension ('2')-> setRowHeight (20 );

// Set font size bold
$ ObjPHPExcel-> getActiveSheet ()-> getDefaultStyle ()-> getFont ()-> setSize (10 );
$ ObjPHPExcel-> getActiveSheet ()-> getStyle ('A2: j1')-> getFont ()-> setBold (true );