Description:
------------
Found bug in function strtr...
Not replace unicode values from array, in binary string.

Reproduce code:
---------------
<?php
    $a = (binary)"AAA"; // In my code I use file_get_contents
                        // function retrun binary value
    $b = array("AAA" => "BBB");
    $c = strtr($a, $b);
    var_dump($a);
    var_dump($b);
    var_dump($c);
?>

Expected result:
----------------
string(3) "AAA" 
array(1) { [u"AAA"]=> unicode(3) "BBB" } 
string(3) "BBB" 

Actual result:
--------------
string(3) "AAA" 
array(1) { [u"AAA"]=> unicode(3) "BBB" } 
string(3) "AAA"

Verified on Debian lenny:

(fa@debian):(~/code/src/php6) $ ~/local/php6/bin/php ~/tmp/strtr_47691.php
string(3) "AAA"
array(1) {
  [u"AAA"]=>
  unicode(3) "BBB"
}
string(3) "AAA"

Seems to be ok on FreeBSD 7.1:

(fa@freebsd):(/usr/home/fa/code/php6) $ ~/local/test/bin/php ~/tmp/strtr_47691.php
string(3) "AAA"
array(1) {
  ["AAA"]=>
  string(3) "BBB"
}
string(3) "BBB"

The development of PHP 6 has been ceased, and even in PHP 7
there'll be no Unicode strings (u"..."). In all recent official PHP
versions the test script works as expected( see
<http://3v4l.org/SXlG3>), so I'm closing the ticket.