vendor/phpoffice/phpexcel/Examples/Quadratic.php

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<html>
<head>
<title>Quadratic Equation Solver</title>
</head>
<body>
<?php

/**	Error reporting		**/
error_reporting(E_ALL);

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

?>
<h1>Quadratic Equation Solver</h1>
<form action="Quadratic.php" method="POST">
Enter the coefficients for the Ax<sup>2</sup> + Bx + C = 0
<table border="0" cellpadding="0" cellspacing="0">
	<tr><td><b>A&nbsp;</b></td>
		<td><input name="A" type="text" size="8" value="<?php echo (isset($_POST['A'])) ? htmlentities($_POST['A']) : ''; ?>"></td>
	</tr>
	<tr><td><b>B&nbsp;</b></td>
		<td><input name="B" type="text" size="8" value="<?php echo (isset($_POST['B'])) ? htmlentities($_POST['B']) : ''; ?>"></td>
	</tr>
	<tr><td><b>C&nbsp;</b></td>
		<td><input name="C" type="text" size="8" value="<?php echo (isset($_POST['C'])) ? htmlentities($_POST['C']) : ''; ?>"></td>
	</tr>
</table>
<input name="submit" type="submit" value="calculate"><br />
If A=0, the equation is not quadratic.
</form>

<?php
/**	If the user has submitted the form, then we need to execute a calculation **/
if (isset($_POST['submit'])) {
	if ($_POST['A'] == 0) {
		echo 'The equation is not quadratic';
	} else {
		/**	So we include PHPExcel to perform the calculations	**/
		include 'PHPExcel/IOFactory.php';

		/**	Load the quadratic equation solver worksheet into memory			**/
		$objPHPExcel = PHPExcel_IOFactory::load('./Quadratic.xlsx');

		/**	Set our A, B and C values			**/
		$objPHPExcel->getActiveSheet()->setCellValue('A1', $_POST['A']);
		$objPHPExcel->getActiveSheet()->setCellValue('B1', $_POST['B']);
		$objPHPExcel->getActiveSheet()->setCellValue('C1', $_POST['C']);


		/**	Calculate and Display the results			**/
		echo '<hr /><b>Roots:</b><br />';

		$callStartTime = microtime(true);
		echo $objPHPExcel->getActiveSheet()->getCell('B5')->getCalculatedValue().'<br />';
		echo $objPHPExcel->getActiveSheet()->getCell('B6')->getCalculatedValue().'<br />';
		$callEndTime = microtime(true);
		$callTime = $callEndTime - $callStartTime;

		echo '<hr />Call time for Quadratic Equation Solution was '.sprintf('%.4f',$callTime).' seconds<br /><hr />';