vendor/phpoffice/phpexcel/Documentation/Examples/Reader/exampleReader14.php

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<?php

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

<title>PHPExcel Reader Example #15</title>

</head>
<body>

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

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

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


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

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

	private $_endRow = 0;

	/**  Set the list of rows that we want to read  */
	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  **/
$objReader = PHPExcel_IOFactory::createReader($inputFileType);


echo '<hr />';


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