Here is a recursive check, without autovivification.
sub _exists {
my ($hash, @keys, @exists) = @_;
if (exists $hash->{$keys[0]}) {
my $key = shift @keys;
push @exists, 1, _exists($hash->{$key}, @keys);
}
return @exists;
}
sub exists_keys {
return &_exists == $#_ ? 1 : ();
}
my %hash;
#$hash{a}{b}{c} = undef;
if (exists_keys(\%hash, qw(a b c))) {
print "Exists.\n";
}
else {
print "Doesn't exists.\n";
}
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