[BUG] Validation challange fails with a comment containing code

[gnieark]

Describe the bug
Validation challange fails with a comment containing code. yes i am a troll, il like solucing it by legacy php code

To Reproduce

1. Go to 'Mario challange and validate
2. Type the correct passphrase (SPOIL EGwvoaKgJtxE0q)
   Put this as comment:

<?php
$baseUrl = "http://s47hok00.fr2.pathwar.net/";

$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $baseUrl);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_COOKIESESSION, true);
curl_setopt($curl, CURLOPT_COOKIEJAR, 'cookie-name'); 
curl_setopt($curl, CURLOPT_COOKIEFILE, 'cookie-name'); 

function getCaptchaFromPageContent($content){
    preg_match('/<p>Captcha: ([^{]*)<\/p>/i', $content, $match);
    return $match[1];
}

function httpPost($curl ,$pass)
{
    curl_setopt($curl, CURLOPT_POSTFIELDS, "password=".$pass);

    $response = curl_exec($curl);
    return $response;
}

$content = "<p>Captcha: </p>";

for ($i = 0; $i < 101; $i++){
    $content = httpPost($curl, getCaptchaFromPageContent($content));
    echo $content."\n".getCaptchaFromPageContent($content)."\n";

}

It fails.
try again without the comment, it's OK