<?php

error_reporting(E_ALL);
set_time_limit(0);

date_default_timezone_set('Europe/London');

?>
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<title>PhpSpreadsheet Reader Example #14</title>

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<h1>PhpSpreadsheet Reader Example #14</h1>
<h2>Reading a Large CSV file in "Chunks" to split across multiple Worksheets</h2>
<?php

require_once __DIR__ . '/../../../src/Bootstrap.php';

$inputFileType = 'Csv';
$inputFileName = './sampleData/example2.csv';

/**  Define a Read Filter class implementing \PhpOffice\PhpSpreadsheet\Reader\IReadFilter  */
class chunkReadFilter implements \PhpOffice\PhpSpreadsheet\Reader\IReadFilter
{
    private $_startRow = 0;

    private $_endRow = 0;

    /**
     * Set the list of rows that we want to read.
     *
     * @param mixed $startRow
     * @param mixed $chunkSize
     */
    public function setRows($startRow, $chunkSize)
    {
        $this->_startRow = $startRow;
        $this->_endRow = $startRow + $chunkSize;
    }

    public function readCell($column, $row, $worksheetName = '')
    {
        //  Only read the heading row, and the rows that are configured in $this->_startRow and $this->_endRow
        if (($row == 1) || ($row >= $this->_startRow && $row < $this->_endRow)) {
            return true;
        }

        return false;
    }
}

echo 'Loading file ',pathinfo($inputFileName, PATHINFO_BASENAME),' using IOFactory with a defined reader type of ',$inputFileType,'<br />';
/*  Create a new Reader of the type defined in $inputFileType  **/
$reader = \PhpOffice\PhpSpreadsheet\IOFactory::createReader($inputFileType);

echo '<hr />';

/*  Define how many rows we want to read for each "chunk"  **/
$chunkSize = 100;
/*  Create a new Instance of our Read Filter  **/
$chunkFilter = new chunkReadFilter();

/*  Tell the Reader that we want to use the Read Filter that we've Instantiated  **/
/*    and that we want to store it in contiguous rows/columns  **/
$reader->setReadFilter($chunkFilter)
          ->setContiguous(true);

/*  Instantiate a new PhpSpreadsheet object manually  **/
$spreadsheet = new \PhpOffice\PhpSpreadsheet\Spreadsheet();

/*  Set a sheet index  **/
$sheet = 0;
/*  Loop to read our worksheet in "chunk size" blocks  **/
/**  $startRow is set to 2 initially because we always read the headings in row #1  **/
for ($startRow = 2; $startRow <= 240; $startRow += $chunkSize) {
    echo 'Loading WorkSheet #', ($sheet + 1), ' using configurable filter for headings row 1 and for rows ', $startRow, ' to ', ($startRow + $chunkSize - 1), '<br />';
    /*  Tell the Read Filter, the limits on which rows we want to read this iteration  **/
    $chunkFilter->setRows($startRow, $chunkSize);

    /*  Increment the worksheet index pointer for the Reader  **/
    $reader->setSheetIndex($sheet);
    /*  Load only the rows that match our filter into a new worksheet in the PhpSpreadsheet Object  **/
    $reader->loadIntoExisting($inputFileName, $spreadsheet);
    /*  Set the worksheet title (to reference the "sheet" of data that we've loaded)  **/
    /*    and increment the sheet index as well  **/
    $spreadsheet->getActiveSheet()->setTitle('Country Data #' . (++$sheet));
}

echo '<hr />';

echo $spreadsheet->getSheetCount(), ' worksheet', (($spreadsheet->getSheetCount() == 1) ? '' : 's'), ' loaded<br /><br />';
$loadedSheetNames = $spreadsheet->getSheetNames();
foreach ($loadedSheetNames as $sheetIndex => $loadedSheetName) {
    echo '<b>Worksheet #', $sheetIndex, ' -> ', $loadedSheetName, '</b><br />';
    $spreadsheet->setActiveSheetIndexByName($loadedSheetName);
    $sheetData = $spreadsheet->getActiveSheet()->toArray(null, false, false, true);
    var_dump($sheetData);
    echo '<br />';
}

?>
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