Whats unless(Perl) in PHP

[iceraider]

*note - I dislike perl now, php is so much easier

I have this code from perl, I can't find how to make it PHP

@req = qw(name email username password repass);
my $req_err;

for (@req) {
 next if $in{$_};
 $req_err++; last;
}

$username = $in{'username'};
 error("Your username can only contain letters,numbers and _") unless $username =~ m< ^ w+ z >x;

Thank you for your time

[128kb_com]

You can try something like:

if (!eregi($regex, $username)) error("error message");

In perl the unless statement is just a reversed and changed up if statement. perl is the only lang I know of that makes use of it... very handy though.