Make code a mess

This code is to make the output HTML code from PHP a mess - as Facebook or Google do.
<?php
ob_start(); // before any output

// page content goes here

$content = ob_get_clean();
echo MinifyHTML($content);

?>

This is the function:
<?php
function MinifyHTML($str) {
$protected_parts = array('<pre>,</pre>','<textarea>,</textarea>', '<,>');
$extracted_values = array();
$i = 0;
foreach ($protected_parts as $part) {
    $finished = false;
    $search_offset = $first_offset = 0;
    $end_offset = 1;
    $startend = explode(',', $part);
    if (count($startend) === 1) $startend[1] = $startend[0];
    $len0 = strlen($startend[0]); $len1 = strlen($startend[1]);
    while ($finished === false) {
        $first_offset = strpos($str, $startend[0], $search_offset);

        if ($first_offset === false) $finished = true;
        else {
            $search_offset = strpos($str, $startend[1], $first_offset + $len0);
            $extracted_values[$i] = substr($str, $first_offset + $len0, $search_offset - $first_offset - $len0);
            $str = substr($str, 0, $first_offset + $len0).'$$#'.$i.'$$'.substr($str, $search_offset);
            $search_offset += $len1 + strlen((string)$i) + 5 - strlen($extracted_values[$i]);
            ++$i;
        }
    }
}
$str = preg_replace("/\s/", " ", $str);
$str = preg_replace("/\s{2,}/", " ", $str);
$replace = array('> <'=>'><', ' >'=>'>','< '=>'<','</ '=>'</');
$str = str_replace(array_keys($replace), array_values($replace), $str);

for ($d = 0; $d < $i; ++$d)
    $str = str_replace('$$#'.$d.'$$', $extracted_values[$d], $str);

return $str;
}