Description:
------------
I was running a benchmark script to test out certain things on my localhost.  Once of my scripts involved performing randomly large math calculations within comments, increasing expotentially.

Reproduce code:
---------------
<?php

$st = array_sum (explode (' ', microtime ()));

ob_start ();

for ($i = 1; $i < 10000; $i++) {
    echo "<!-- Hello, World! " .  ($i % round(sqrt($i*2))) ^ $i .  " -->\n";
}

ob_end_flush ();

echo round ((array_sum (explode (' ',microtime ())) - $st), 5) . "\n";

?>

Expected result:
----------------
I expected for the page to hesistate for a minute or so, and then print out the expected benchmark along with the comments and numbers within them.

Actual result:
--------------
Strange HTML/Chinese characters:

(e.g., ??&#5389;&#3352;?l??&#5389;&#3355;?l??&#5389;&#3354;?l??&#5389;&#3349;?l??&#5389;&#3348;?l??&#5133;&#3357;?l??&#5133;&#3356;?l??&#5133;&#3359;?l??&#5133;&#3358;?l??&#5133;&#3353;?l??&#5133;&#3352;?l??&#5133;&#3355;?l??&#5133;&#3354;?l??&#5133;&#3349;?l??&#5133;&#3348;?l??&#5901;&#3357;?l??&#5901;&#3356;?l??&#5901;&#3359;?l??&#5901;&#3358;?l??&#5901;&#3353;?l??&#5901;&#3352;?l??&#5901;&#3355;?l??&#5901;&#3354;?l??&#5901;&#3349;?l??&#5901;&#3348;?l??&#5645;&#3357;?l??&#5645;&#3356;?l??&#5645;&#3359;?l??&#5645;&#3358;?l??&#5645;&#3353;?l??&#5645;&#3352;?l??&#5645;&#3355;?l??&#5645;&#3354;?l??&#5645;&#3349;?l??&#5645;&#3348;?l??&#6413;&#3357;?l??&#6413;&#3356;?l??&#6413;&#3359;?l??&#6413;&#3358;?l??&#6413;&#3353;?l??&#6413;&#3352;?l??&#6413;&#3355;?l??&#6413;&#3354;?l??&#6413;&#3349;?l??&#6413;&#3348;?l??&#6157;&#3357;...)