vendor/phpoffice/phpexcel/Documentation/Examples/Reader/exampleReader11.php

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<?php

error_reporting(E_ALL);
set_time_limit(0);

date_default_timezone_set('Europe/London');

?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

<title>PHPExcel Reader Example #11</title>

</head>
<body>

<h1>PHPExcel Reader Example #11</h1>
<h2>Reading a Workbook in "Chunks" Using a Configurable Read Filter (Version 1)</h2>
<?php

/** Include path **/
set_include_path(get_include_path() . PATH_SEPARATOR . '../../../Classes/');

/** PHPExcel_IOFactory */
include 'PHPExcel/IOFactory.php';


$inputFileType = 'Excel5';
//	$inputFileType = 'Excel2007';
//	$inputFileType = 'Excel2003XML';
//	$inputFileType = 'OOCalc';
//	$inputFileType = 'Gnumeric';
$inputFileName = './sampleData/example2.xls';


/**  Define a Read Filter class implementing PHPExcel_Reader_IReadFilter  */
class chunkReadFilter implements PHPExcel_Reader_IReadFilter
{
	private $_startRow = 0;

	private $_endRow = 0;

	/**  We expect a list of the rows that we want to read to be passed into the constructor  */
	public function __construct($startRow, $chunkSize) {
		$this->_startRow	= $startRow;
		$this->_endRow		= $startRow + $chunkSize;
	}

	public function readCell($column, $row, $worksheetName = '') {
		//  Only read the heading row, and the rows that were configured in the constructor
		if (($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 />';