What do these CGI Char mean?

[salc76]

Can someone explain to me what some characters represent in the following lines of cgi code?

- eq?
- ""?
- !~?
- &&?
- ne?

if($name eq "" || $staddress eq "" || $city eq "" || $province eq "" || $postalcode eq "" || $phonenumber eq "" || $email eq "") {
&error();
}
elsif($name ne "" && $name !~ m/^[A-Za-z][A-Za-z\s]*/) {
&error();
}
elsif($staddress ne "" && $staddress !~ m/^[0-9A-Za-z\.\#][0-9A-Za-z\.\#]*/) {
&error();

 

[KevinADC]

eq - "equal" (string operator)
"" - an empty string
!~ - "not equal" (regexp binding operator)
&& - "and" (logical "and" operator)
ne - "not equal" (string operator)

http://perldoc.perl.org/perlop.html

thats not CGI code, it's perl code.


------------------------------------------
- Kevin, perl coder unexceptional!

 

[PaulTEG]

|| == shortcircuit or, or leftwise or if this 'or' operator finds a true case, it doesn't bother evaluating the rest of the cases for true.
likewise && in the event of a false case, it doesn't bother evaluating the rest of the cases for true.

if (isiteven(1) || isiteven(2) || isiteven (3) ) {
  print "  End test 1\n";
} else {
  print "  Test Failed\n";
}

if (isiteven(1) && isiteven(2) && isiteven (3) ) {
  print "  End test 2\n";
} else {
  print "  Test Failed\n";
}
if (isiteven(2) && isiteven(4) && isiteven (6) ) {
  print "  End test 3\n";
} else {
  print "  Test Failed\n";
}

sub isiteven {
  ($var)=@_;
  if ($var%2==0) {
    print "$var is even\n";
    return 1;
  } else {
    print "$var is false\n";
    return 0;
  }
}

returns

1 is false
2 is even
  End test 1
1 is false
  Test Failed
2 is even
4 is even
6 is even
  End test 3

It's a form of code efficiency in that the logical and and or operators will evaluate every case.

Paul
------------------------------------
Spend an hour a week on CPAN, helps cure all known programming ailments ;-)