Description:
------------
call_user_func_array seems to corrupt the array that is 
passed to the user function through it.

If an array of two strings are passed, and you try to 
print $strings[0] you get the first letter of the first 
element. If you try to print $strings[1] you get the 
2nd letter of the first element.

Reproduce code:
---------------
<?php
function test($testing){
	echo $testing[1];
}

$array = array('im testing', 'hello?');

call_user_func_array('test', $array);
echo "\n";
echo $array[1];
?>

Expected result:
----------------
hello?
hello?

Actual result:
--------------
m
hello?