A solution for a coding challenge

mythic.php

<?php
/*
Uses: https://gist.github.com/ircmaxell/1232629
*/
require_once 'Math.php';
$math = new Math();

$html = file_get_contents("http://sphinx.mythic-beasts.com/cgi-bin/job.pl");

preg_match("/.+?(?=,)/", $html, $find_equation);

$find_equation[0] = preg_replace("/^(<p>Evaluate)\s+/", "", $find_equation[0]);

$answer = $math->evaluate($find_equation[0]);

echo($find_equation[0] . " = " . $answer . "\n");

preg_match("/(?<=(name=\"id\" value=\"))[0-9 a-z A-Z]*/", $html, $id);

$params=['answer'=>$answer, 'id'=>$id[0], 'submit'=>'submit'];
$defaults = array(
    CURLOPT_URL => 'http://sphinx.mythic-beasts.com/cgi-bin/job.pl', 
    CURLOPT_POST => true,
    CURLOPT_POSTFIELDS => $params,
    CURLOPT_VERBOSE => true,
);
$ch = curl_init();
curl_setopt_array($ch, $defaults);

$result = curl_exec($ch);
?>