[RESOLVED] 0 = false??

dougal85

OK, i have a function that takes in a mixed value, it can either be a number ranging from 0-7 or FALSE.

So, lets make a dummy function...


function testing($mixed){

if($mixed){

echo "its not false, i want 0-7 to trigger this";

}else{

echo "it is false, i want only FALSE to trigger this, not 0 too";

}

}

However, zero is also read as false by PHP. How do i stop this? i tried things like;

$mixed !=FALSE
$mixed === FALSE

but i had no luck. any suggestions are appreciated.

Thanks

thorpe

Thats going to be confusing but...

if ($mixed == 0 || $mixed) {

NogDog

Well, the most complete check would probably be:

if($mixed === FALSE)
{
   // it's false
}
elseif(is_int($mixed) and $mixed >= 0 and $mixed <= 7)
{
   // it's an integer between 0 and 7, inclusive
}
else
{
   // it's something else
}

Note that in this case a value of 5 would evaluate as "between 0 and 7" but a value of "5" (a string with the single character "5") would not. So depending on what you want to do, you might have to change the elseif to:

elseif(ctype_digit($mixed) and $mixed >= 0 and $mixed <= 7)

NogDog

thorpe wrote:
Thats going to be confusing but...
if ($mixed == 0 || $mixed) {

That would need to be...

if($mixed === 0 || $mixed) {

...if you don't want it to match boolean FALSE, too.

NogDog

PS: See this page for more info on how non-boolean expressions are converted to boolean in situations where you are not using the "identical" operators === and !== .

dougal85

lol, multiple posting 😛

Thanks... that really cleared it up for me 🙂

Totally Resolved! 😃