whs/calc.php

## calc.php
<?php
$allowed = array("Solve", "Simplify", "Factor", "Think");
if(!in_array($_REQUEST['method'], $allowed)) die("Bad method!");
if(strstr(";", $_REQUEST['input'])) die("Hack?");
$input = $_REQUEST['input'];
$input = str_replace("=", "==", $input);
$path = "C:\\Program Files\\Wolfram Research\\Mathematica\\7.0\\math.exe";
$cmd = $_REQUEST['method'] . "[".$input."]";
if($_REQUEST['method'] == "Think"){
	$cmd = $_REQUEST['input'];
}
file_put_contents("tmpinput", "Export[\"tmpoutput.png\", ".$cmd."]\nExport[\"question.png\", ".$_REQUEST['input']."]\nExit[]");
system("\"$path\" -noprompt -run \"<<tmpinput\"");

## imgs.php
<?php
header("Content-Type: image/png");
$allowed = array("question", "tmpoutput");
if(!in_array($_GET['file'], $allowed)) die();
print file_get_contents($_GET['file'].".png");

## index.html
<!doctype html>
<html>
<head>
	<meta charset="windows-874">
	<title>Solver</title>
	<script src="jq.js"></script>
	<style>
body{
	font-family: verdana, sans-serif;
}
input[type=text]{
	font-size: 24pt;
	width: 80%;
}
form{text-align: center;}
#output{
	min-height: 200px;
	text-align: center;
	font-size: 32pt;
}
#footer{text-align: center; color: #bbb; margin-top: 40px;}
	</style>
	<script>
$(function(){
	$("form").submit(function(){
		$("#output").html("Loading...");
		$.post("calc.php", $("form").serialize(), function(d){
			$("#output").html("<img src='imgs.php?file=question&t="+new Date().getTime()+"'> = <img src='imgs.php?file=tmpoutput&t="+new Date().getTime()+"'>");
		});
		return false;
	});
});
	</script>
</head>
<body>
<form action="#">
<select name="method">
	<option value="Think">คำนวน</option>
	<option value="Solve">หาค่า</option>
	<option value="Simplify">ทำให้อยู่ในรูปอย่างง่าย</option>
	<option value="Factor">แยกตัวประกอบพหุนาม</option>
</select>
<input type="text" name="input" autofocus="true" placeholder="ใส่สูตรที่ต้องการคำนวน">
</form>
<div id="output"></div>
<div id="footer">Powered by Mathemetica</div>
</body>
</html>
	<?php
	$allowed = array("Solve", "Simplify", "Factor", "Think");
	if(!in_array($_REQUEST['method'], $allowed)) die("Bad method!");
	if(strstr(";", $_REQUEST['input'])) die("Hack?");
	$input = $_REQUEST['input'];
	$input = str_replace("=", "==", $input);
	$path = "C:\\Program Files\\Wolfram Research\\Mathematica\\7.0\\math.exe";
	$cmd = $_REQUEST['method'] . "[".$input."]";
	if($_REQUEST['method'] == "Think"){
	$cmd = $_REQUEST['input'];
	}
	file_put_contents("tmpinput", "Export[\"tmpoutput.png\", ".$cmd."]\nExport[\"question.png\", ".$_REQUEST['input']."]\nExit[]");
	system("\"$path\" -noprompt -run \"<<tmpinput\"");
	<?php
	header("Content-Type: image/png");
	$allowed = array("question", "tmpoutput");
	if(!in_array($_GET['file'], $allowed)) die();
	print file_get_contents($_GET['file'].".png");
	<!doctype html>
	<html>
	<head>
	<meta charset="windows-874">
	<title>Solver</title>
	<script src="jq.js"></script>
	<style>
	body{
	font-family: verdana, sans-serif;
	}
	input[type=text]{
	font-size: 24pt;
	width: 80%;
	}
	form{text-align: center;}
	#output{
	min-height: 200px;
	text-align: center;
	font-size: 32pt;
	}
	#footer{text-align: center; color: #bbb; margin-top: 40px;}
	</style>
	<script>
	$(function(){
	$("form").submit(function(){
	$("#output").html("Loading...");
	$.post("calc.php", $("form").serialize(), function(d){
	$("#output").html("<img src='imgs.php?file=question&t="+new Date().getTime()+"'> = <img src='imgs.php?file=tmpoutput&t="+new Date().getTime()+"'>");
	});
	return false;
	});
	});
	</script>
	</head>
	<body>
	<form action="#">
	<select name="method">
	<option value="Think">คำนวน</option>
	<option value="Solve">หาค่า</option>
	<option value="Simplify">ทำให้อยู่ในรูปอย่างง่าย</option>
	<option value="Factor">แยกตัวประกอบพหุนาม</option>
	</select>
	<input type="text" name="input" autofocus="true" placeholder="ใส่สูตรที่ต้องการคำนวน">
	</form>
	<div id="output"></div>
	<div id="footer">Powered by Mathemetica</div>
	</body>
	</html>