Description:
------------
When switch on BINARY_PROTOCOL we see strange things while using values got from getMulti method.
Look at the end of the output - we get NULL instead off the "value0".
If the BINARY_PROTOCOL is turned off everything works fine.

Values:
array(2) { ["key_0"]=> string(6) "value0" ["key_0_additional"]=> string(17) "value0_additional" }
key_0:
string(6) "value0"
Values:
array(2) { ["key_0_additional"]=> string(17) "value0_additional" ["key_0"]=> string(6) "value0" }
key_0:
NULL 

Reproduce code:
---------------
$cache = new Memcached();
$cache->setOption(Memcached::OPT_BINARY_PROTOCOL, true);
$cache->addServers( array( array('localhost', 11211) ) );
$cache->set( 'key_0', 'value0' );
$cache->set( 'key_0_additional', 'value0_additional' );
// -------------- NORMAL
$keys = array( 'key_0', 'key_0_additional' );
$values = $cache->getMulti( $keys );
echo "Values:<br>\n"; var_dump( $values ); 
echo "<br>\n";
echo "key_0:<br>\n"; var_dump( $values['key_0'] );
echo "<br>\n";
// --------------- REVERSED KEY ORDER
$keys = array( 'key_0_additional', 'key_0' );
$values = $cache->getMulti( $keys );
echo "Values:<br>\n"; var_dump( $values );
echo "<br>\n";
echo "key_0:<br>\n"; var_dump( $values['key_0'] );
echo "<br>\n";

Expected result:
----------------
key_0:
string(6) "value0"


Actual result:
--------------
key_0:
NULL