operator, drive me nuts!!!

scoppc

Somebody please see my simplest code in the world but cant seem to work fine!
It keep giving me "Oopsss... you change em!"

<?php
$string='a';
if ($string!=='a' or $string!=='b' or $string!=='c'){
print "Oopsss... you change em!";
}else{
print "correct";
}
?>

😕

thanks in advance.

scoppc

gwchamb

Somebody please see my simplest code in the world but cant seem to work fine!
It keep giving me "Oopsss... you change em!"
$string='a';
if ($string!=='a' or $string!=='b' or $string!=='c'){

if ($str != 'a' || $str != 'b' || $str != 'c') {
    print("Oops...");
} else {
    print("Correct...");
}

scoppc

It doesn't work at all. The same result I got.
Do you think that there's something wrong with my PHP 4.2.3??? or is there any other syntax???

I just cant see any problems with my code!

tomhath

I just cant see any problems with my code!

You must not be looking very close then. Walk through the logic:

Set $string to the letter 'a'

If $string is not the letter 'a' OR if $string is not the letter 'b' OR ir $string is not the letter 'c' then print Ooops

Gee gosh, if $string is 'a', then it's probably not 'b' OR 'c', so of course it prints Oops every time. :rolleyes:

Incubator

yep,

if ($string == 'a' || $string!='b' && $string!='c')
...
should do it i think

tomhath

should do it i think

Should do what? Think through that logic now:

If string is equal to 'a' or string is not equal to 'b' and string is not equal to 'c' then ...

Well, if it is equal to 'a', it sure as heck won't equal 'b' or 'c' :rolleyes:

Read up on something called DeMorgan's Law. It's the distribution property for logic.

!($str == 'a' || $str == 'b' || $str == 'c') == ($str != 'a' && $str != 'b' && $str != 'c')

daveyboy

Maybe you should just say what it is you're trying to do. What do you want? Success on "a" or success on "b" or success if it's neither "a", nor "b", nor "c".

scoppc

thanks for the logic. I guess I need to revise my College Subject on De Morgans Law. hehe .. 😉