Creating a spreadsheet
Spreadsheet class is the core of PhpSpreadsheet. It contains
references to the contained worksheets, document security settings and
document meta data.
To simplify the PhpSpreadsheet concept: the
represents your workbook.
Typically, you will create a workbook in one of two ways, either by loading it from a spreadsheet file, or creating it manually. A third option, though less commonly used, is cloning an existing workbook that has been created using one of the previous two methods.
Loading a Workbook from a file
Details of the different spreadsheet formats supported, and the options available to read them into a Spreadsheet object are described fully in the Reading Files document.
$inputFileName = './sampleData/example1.xls'; /** Load $inputFileName to a Spreadsheet object **/ $spreadsheet = \PhpOffice\PhpSpreadsheet\IOFactory::load($inputFileName);
Creating a new workbook
If you want to create a new workbook, rather than load one from file, then you simply need to instantiate it as a new Spreadsheet object.
/** Create a new Spreadsheet Object **/ $spreadsheet = new \PhpOffice\PhpSpreadsheet\Spreadsheet();
A new workbook will always be created with a single worksheet.
Clearing a Workbook from memory
The PhpSpreadsheet object contains cyclic references (e.g. the workbook
is linked to the worksheets, and the worksheets are linked to their
parent workbook) which cause problems when PHP tries to clear the
objects from memory when they are
unset(), or at the end of a function
when they are in local scope. The result of this is "memory leaks",
which can easily use a large amount of PHP's limited memory.
This can only be resolved manually: if you need to unset a workbook,
then you also need to "break" these cyclic references before doing so.
PhpSpreadsheet provides the
disconnectWorksheets() method for this