Some sample data would be helpful in figuring out if you have other problems, but you most certainly should not delete from an array you are looping though with foreach.

Try looping like this instead: 

for ($acount = $#{$harry{$k}}; $acount >= 0;--$account) {
   my $a = $harry{$k}[$acount];
   for ($bcount = $#{$harry{$phash{$k}}}; $bcount >= 0; --$bcount) {
       my $b = $harry{$phash{$k}}[$bcount];
       if ($a eq $b) ...
           splice(@{$harry{$k}}, $acount, 1);
           splice(@{$harry{$phash{$k}}}, $bcount, 1);
       ...

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In reply to Re: Accessing (deleting) array elements in a hash of arrays by ysth
in thread Accessing (deleting) array elements in a hash of arrays by onslaught

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