Manipulating the array you're iterating over is generally not a good idea. If what you want is to process the elements of the array beginning from the end, use either while as advised by psini or use for/foreach on a reversed list (and do not pop the elements, it's not necessary). 
foreach(reverse @stack1){
    print "found $_\n";
}

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In reply to Re: using foreach by pjotrik
in thread using foreach by Anonymous Monk

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