index.php

<?php
session_start();

// A really cool tool for debuging
/* require $_SERVER['DOCUMENT_ROOT'] . '/kint/Kint.class.php'; */

if ($_SERVER['REQUEST_METHOD'] == 'POST') {

	$throws = $_POST['number'];

	if (empty($throws))
		$throws = 0;

	// Stopping stupid input

	define("maximum", 5000);
	define("minimum", 10);
	define("maxumumRandomNumberValue", 1000000000);
	define("pi", 3.14159265359);

	$static = 0;

	if ($static) {

		if ($throws < minimum) {

			echo ("$throws throws is a few little, so try " . minimum . " instead");
			$throws = minimum;

		}

		if ($throws > maximum) {

			echo ("The maximum API limit is 10,000, therefore your request has been capped.");
			$throws = maximum;
		}

		// We need two random values for every throw - x and y positions
		$values = $throws * 2;

		$link = "http://www.random.org/integers/?num=$values&min=1&max=1000000000&col=1&base=10&format=plain&rnd=new";

		$connection = curl_init();
		curl_setopt($connection, CURLOPT_URL, $link);
		curl_setopt($connection, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($connection, CURLOPT_TIMEOUT, '5');
		$data = curl_exec($connection);
		curl_close($connection);

		// As the numbers were given as a single string spereated by line breaks, create an array of the numbers
		$randomNumbers = explode("\n", $data);
		// The last element will be empty as there is nothing after the final line break, so remove it
		array_pop($randomNumbers);

		$xPositions = array_slice($randomNumbers, 0, $throws);
		$yPositions = array_slice($randomNumbers, $throws);

		$inTheCircle = 0;

		for ($i = 0; $i < $throws; $i++) {

			$x = $xPositions[$i] / maxumumRandomNumberValue;
			$y = $yPositions[$i] / maxumumRandomNumberValue;

			// Use the distance formula to wark out the distance from the origin
			$distance = sqrt(pow($x, 2) + pow($y, 2));
			// If the point is in the circle increase the number by one
			if ($distance <= 1)
				$inTheCircle++;

			echo "x: $x y: $y distance: $distance<br>";
		}

	}

	else {

		$inTheCircle = 0;

		for ($i = 0; $i < $throws; $i++) {

			$x = rand() / getrandmax();
			$y = rand() / getrandmax();

			// Maximum value is 2147483647

			// Use the distance formula to wark out the distance from the origin
			$distance = sqrt(pow($x, 2) + pow($y, 2));
			// If the point is in the circle increase the number by one
			if ($distance <= 1)
				$inTheCircle++;

			/*             echo "x: $x y: $y distance: $distance<br>"; */
		}



	}

	// The number of 'arrows' in the circle * 4 should be equal to pi

	$pi = ($inTheCircle / $throws) * 4;
	$accuracy = (($pi/pi) -1) * 100;
	echo ("$pi - Accurate to $accuracy % - $throws Throws");


	include('submit.html');


}

else {

	include('submit.html');
}

?>