You left out a lot of detail, like the rest of the code. The comparison $member == $who is legitimate syntax, and if I make some assumptions about the surrounding code, it works fine here.

use strict;

my @ops = ( 1 .. 20 );
my $who = 10;
my $op;

foreach my $member (@ops) {
        if ($member == $who) {
                $op = 1;
                last;
        }
}
print "Found one\n" if $op;
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Perhaps you could give us more detail to work with?

Scott