<?php
 
$data = 'Spread-spectrum сообщения - с очень низким SNR и размазанные по нескольким тредам?';
 
$data = iconv('UTF-8', 'Windows-1251', $data);
$packed = gzdeflate($data, 1, ZLIB_ENCODING_RAW);
do {
    $i = mt_rand(strlen($packed)/4, strlen($packed)*3/4 - 1);
    $packed[$i] = chr(ord($packed[$i]) xor 1);
    $data = @gzinflate($packed);
} while(empty($data));
$data = iconv('Windows-1251', 'UTF-8', $data);
 
echo $data . PHP_EOL;
 

PD9waHAKCiRkYXRhID0gJ1NwcmVhZC1zcGVjdHJ1bSDRgdC+0L7QsdGJ0LXQvdC40Y8gLSDRgSDQvtGH0LXQvdGMINC90LjQt9C60LjQvCBTTlIg0Lgg0YDQsNC30LzQsNC30LDQvdC90YvQtSDQv9C+INC90LXRgdC60L7Qu9GM0LrQuNC8INGC0YDQtdC00LDQvD8nOwoKJGRhdGEgPSBpY29udignVVRGLTgnLCAnV2luZG93cy0xMjUxJywgJGRhdGEpOwokcGFja2VkID0gZ3pkZWZsYXRlKCRkYXRhLCAxLCBaTElCX0VOQ09ESU5HX1JBVyk7CmRvIHsKICAgICRpID0gbXRfcmFuZChzdHJsZW4oJHBhY2tlZCkvNCwgc3RybGVuKCRwYWNrZWQpKjMvNCAtIDEpOwogICAgJHBhY2tlZFskaV0gPSBjaHIob3JkKCRwYWNrZWRbJGldKSB4b3IgMSk7CiAgICAkZGF0YSA9IEBnemluZmxhdGUoJHBhY2tlZCk7Cn0gd2hpbGUoZW1wdHkoJGRhdGEpKTsKJGRhdGEgPSBpY29udignV2luZG93cy0xMjUxJywgJ1VURi04JywgJGRhdGEpOwoKZWNobyAkZGF0YSAuIFBIUF9FT0w7Cg==