OR statement returning wrong number

Question

If i put 1 or 2 into this it will return 4. Why is this?I\'m more used to python stuff so sorry if this is rather basic.

e = 1;
f=0;

if(e==1){f=1;}
if(e==2){f=2         


        

Answer 1

If you take a look at booleans, you'll see that pretty much everything is equals to true in php (except for those values stated in that same page). So what you really have is something like this:

if($e==3 or true)

And since anything or true is always true, you get that (weird, but not unexpected) result.

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In case you want to check if $e is equals to 3 or 4, do it like so:

if($e==3 || $e==4){

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Note that since these are not if..else statements, every condition is being checked. Take a look at the expanded version:

if($e==1){
    $f=1;
}
if($e==2){
    $f=2;
}
if($e==3 or 4){
    $f=4;
}

This /\ is different from

if($e==1){
    $f=1;
}elseif($e==2){
    $f=2;
}elseif($e==3 or 4){
    $f=4;
}

Since the latter only checks every condition in case none of the previous fit.

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Another side note.. since you like python, that code could be converted into this single line:

$f = ($e==3 || $e==4) ? 4 : $e;