/*for simple case just wrap array in some array function. That will cause small overhead, but at least save your internal pointer*/
$Foo = array('val1', 'val2', 'val3');
end($Foo);
var_dump(key($Foo));
$AllOkay = array_merge($Foo);
var_dump(key($Foo));

----------
/*But to make immune running context for error handler function nothing helps, except ugly serialize/unserialize solution*/

error_reporting(E_ALL); 
function TestErrorHandler($severity, $message, $filename, $line,
$super_globals) 
{ 
    global $foo;
    $foo = unserialize(serialize($super_globals));
} 

class Test  
{ 
     function run()  
     { 
          $Res = array('val1', 'val2', 'val3'); 
          end($Res); 
          var_dump(key($Res)); 
          HEY;//raise notice error 
          var_dump(key($Res));      
     } 
} 
$test = new Test(); 
set_error_handler('TestErrorHandler'); 
$test-> run();

Duplicate of bug #40509.

I'm described problem, that is not foreach related. Just
1. Straight copy from one global scope variable to another
2. Copy from current runing context to global variable.

Not iterating local varibale after copying element of global array.
This is another bug, but may be from same "family".
And please remember another one http://bugs.php.net/bug.php?id=37715
Problem appeared at 4.4.2 and 5.1.2 and was reported year ago...

May be I'm described duplicate of "This is expected and not going to be changed" bug instead of assigned 'foreach' bug?

Dmitry, check this out too, along with all those other reports about same issue.. :)

The bug is not related to #40509 and #40705

This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
Thank you for the report, and for helping us make PHP better.