Question about logical operators

[Jiokah]

I have a simple question. How would I write the following expression while using the variable only once?

 

if ($someVariable == 3 || $someVariable == 6) { //Do Something }

 

Thanks!

[PFMaBiSmAd]

Put the values you want to test for in an array and then use the in_array() function in the if() statement - http://php.net/in_array

[thebadbad]

You could use switch, or an array:

 

<?php
switch ($someVariable) {
case 3:
case 6: // do something
}
?>

 

<?php
if (in_array($someVariable, array(3, 6))) {
// do something
}
?>

[Jiokah]

Good suggestions, but I think they over-complicate things a bit more. I was hoping to solve this within a single expression, ie "If variable equals 3 or 6, return true" instead of "If variable equals 3 or variable equals 6, return true".

 

I thought of this example:

 

if ($someVariable == (5 || 6)) {//Do Something}

 

...but both 5 and 6 are true, therefore the expression would always return true.

 

The actual expression I'm hoping to simplify is the following:

 

(strlen($someNumber) > 16 || strlen($someNumber) < 6) //Returns true or false

[lemmin]

if ($someVariable == (5 || 6)) {//Do Something}

 

If you look at how it parses this, (5 || 6) is checked first. Is 5 (true) || 6(true)? Yep! Then it will check if $someVariable is true, since that is what was returned inside the parenthesis. The reason this happens is because the logical operators are comparing two conditions and the only way to have the conditions varry is by using the comparison operators.

 

In short, you can't. If all you are trying to do is reduce the number of times you are calling the strlen function, just use:

$someNumberLen = strlen($someNumber);
($someNumberLen > 16 || $someNumberLen < 6) //Returns true or false

 

Good luck!

 

[Jiokah]

I knew (5 || 6) would return true regardless, as I explained in my previous post, I had simply included that example to give people a better understanding of what I'm getting at.

 

I think your right lemmin, it doesn't look possible. Oh well. I don't really NEED to do this per se, but I think it'd just make my code look neater.

[marcus]

why not just something like:

 

$range = range(6,16);
$variable = "hello!";

if(in_array(strlen($variable),$range)){
// OMG 
}else {
// FAIL
}

[Jiokah]

Because that's not accomplishing what I want in one expression. I'm aware of all the hundreds of ways I can accomplish this with minimal code, I'm a fairly advanced programmer. My question was simply regarding syntax, not method.

 

Thanks though