test.php

<?php

use PHPMathParser\Math;

require_once 'vendor/autoload.php';

$math = new Math();

//Positive Integer Tests
	$answer = $math->evaluate('10 / 5');
	var_dump($answer);echo "<br /><br />";
	// int(2)

	$answer = $math->evaluate('(2 + 3) * 4');
	var_dump($answer);echo "<br /><br />";
	// int(20)

	$answer = $math->evaluate('1 + 2 * ((3 + 4) * 5 + 6)');
	// 1 + 2 * (7 * 5 + 6)
	// 1 + 2 * (35 + 6)
	// 1 + 2 * 41
	// 1 + 82
	var_dump($answer);echo "<br /><br />";
	// int(83)

	$answer = $math->evaluate('9 * (3+8) - 6 - 45');
	var_dump($answer);echo"<br /><br />";
	// 99 - 6 - 45
	// int(48)

	$answer = $math->evaluate('1 * 2 + ((3 + 4) * 5 + 6)');
	// 2 + (7 * 5 + 6)
	// 2 + (35 + 6)
	var_dump($answer);echo "<br /><br />";
	// int(43)

	$answer = $math->evaluate('(1 + 2) * (3 + 4) * (5 + 6)');
	var_dump($answer);echo "<br /><br />";
	// int(231)

	$math->registerVariable('a', 4);
	$answer = $math->evaluate('($a + 3) * 4');
	var_dump($answer);echo "<br /><br />";
	// int(28)

	$math->registerVariable('a', 5);
	$answer = $math->evaluate('($a + $a) * 4');
	var_dump($answer);echo "<br /><br />";
	// int(40)

//Float Tests
	$answer = $math->evaluate('1.45 + 3');
	var_dump($answer);echo "<br /><br />";
	// float(4.45)

	$answer = $math->evaluate('0.45 + 3.5');
	var_dump($answer);echo "<br /><br />";
	// float(3.95)

	$answer = $math->evaluate('10.6 / 1.2');
	var_dump($answer);echo "<br /><br />";
	// float(8.83333333333)

	$answer = $math->evaluate('(1.65 + 2) * (3.1415 + 4) * (5 + 6.8989)');
	var_dump($answer);echo "<br /><br />";
	// float(310.162379378) (but 310.1623793775 in Apple and Windows Calculators)

	$math->registerVariable('a', 5.36464);
	$answer = $math->evaluate('($a + $a) * 4');
	var_dump($answer);echo "<br /><br />";
	// float(42.91712)

//Neg Unary Operator Tests
	$answer = $math->evaluate('3 - -3');
	var_dump($answer);echo " <br /><br />";
	//int(6)

	$answer = $math->evaluate('-2 + -3');
	var_dump($answer);echo " <br /><br />";
	//int(-5)

	$answer = $math->evaluate('-2.5 / 0.5');
	var_dump($answer);echo "<br /><br />";
	//float(-5)

	$answer = $math->evaluate('-9 * (-3+8) - 6 - -45');
	var_dump($answer);echo "<br /><br />";
	//int(-6)

	$answer = $math->evaluate('(10 / 5 * -(1 + 2))');
	var_dump($answer);echo "<br /><br />";
	//int(-6)

	$answer = $math->evaluate('-7.3 * (-3.2+8) - 6 - -45.5');
	var_dump($answer);echo "<br /><br />";
	// float(4.46)

	$math->registerVariable('a', -5.5);
	$answer = $math->evaluate('($a + $a) * 4');
	var_dump($answer);echo "<br /><br />";
	// float(-44)