Adding a couple more tests to your script gives us a clue:
@keys = qw(one two five);
unshift @keys,'four';
print "@keys\n";
if (@hash{@keys}) {
print "yep\n";
} else {
print "nope\n";
}
@keys = qw(one two five);
push @keys, 'two';
print "@keys\n";
if (@hash{@keys}) {
print "yep\n";
} else {
print "nope\n";
}
Gives the result:
four one two five
yep
one two five two
nope
It would appear that only the presence of the last key in the array is affecting whether the test returns true or false.
I would suggest a possible solution would be to abuse grep, thus:
if ( grep{ exists( $hash{$_} ) } @keys ) {
print "yep\n";
} else {
print "nope\n";
}
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