Check multiple variables (boolean) in PHP

Question

I'm using this in my code but I think it can be improved and can be done a simpler way?

if($phaseOne == true && $phaseTwo == true && $phaseThree == true) {

}

Sometimes nested if's are better as you can quicker reject the whole code. Say $phaseOne is false. In your one line code it will still try all three. If you nested it with `if ($phaseOne){ if ($phaseTwo){ }}` the code will fail at the first try — Andreas, Dec 16 '16 at 13:54
Put them in an array and iterate over them. Old programming wisdom says "2 or more, use a for" — GordonM, Dec 16 '16 at 13:58

score 7 · Answer 1 · answered Dec 16 '16 at 13:50

You can do it like this:

if($phaseOne && $phaseTwo && $phaseThree) { ... }

Or use ternary operator, if you're trying to define a variable on the basis of these conditions like this:

$var = ($phaseOne && $phaseTwo && $phaseThree) ? true : false;

Hope this helps!

score 1 · Answer 2 · answered Dec 16 '16 at 13:55

1

Assuming you have an array with an arbitrary number of logical variables:

$logical = array($phraseOne,$phraseTwo,....);
$allTrue = array_reduce($logical, function ($x,$y) {return $x && $y;},true);
if($allTrue) {
}

answered Dec 16 '16 at 13:55

Uri Goren

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score 0 · Answer 3 · answered Dec 16 '16 at 13:50

0

Do just:

if($phaseOne && $phaseTwo && $phaseThree)

answered Dec 16 '16 at 13:50

Dave Plug

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It's better to [add more context/explanation](http://meta.stackexchange.com/questions/114762/explaining-entirely-code-based-answers) around code (as opposed to just having a code-only answer) as that makes the answer more useful. – EJoshuaS - Stand with Ukraine Dec 16 '16 at 17:12

score 0 · Answer 4 · answered Dec 16 '16 at 13:53

You don't need to compare it against true.

if ($phaseOne && $phaseTwo && $phaseThree) {

}

This occurs because the result of any comparison is a boolean:

var_dump(1 == 1); // bool(true)
var_dump(1 == 2); // bool(false)

Also if you variable contains a number, it can be used directly:

if (1) {
     // This will be executed
}

if (0) {
     // This will not be executed
}

Zero will be always be treated as false, any other number (positive or negative) will be true.

score 0 · Answer 5 · edited May 23 '17 at 12:24

0

Unless you need to check each variable as explicitly identical to a boolean or variable, (see this stack overflow thread)

I'd do it this way

if ($phaseOne && $phaseTwo && $phaseThree) {}

Otherwise, I'd do it this way

if ($phaseOne === true && $phaseTwo === true && $phaseThree === true) {}

edited May 23 '17 at 12:24

Community

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answered Dec 16 '16 at 13:55

score 0 · Answer 6 · answered Dec 16 '16 at 14:00

0

Try with this:

 ($phaseOne && $phaseTwo && $phaseThree) ? {//do something} : '';

answered Dec 16 '16 at 14:00

LF00

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score 0 · Answer 7 · answered Dec 16 '16 at 14:31

0

Although I think it is arbitrary, controlversial, trivial, and won't preach the use of this, just for fun and learning - here's some typical php variable type juggling that will work also and takes up the least space... efficient in terms of source code length.

if($phaseOne*$phaseTwo*$phaseThree) { ... }

answered Dec 16 '16 at 14:31

Werner

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the difference is that all values need to accessed unconditionally, whereas by using `&&` or `||` operators, you gain the efficiency of an early "short circuit" and thus less potential evaluations. – mickmackusa Jul 15 '22 at 05:26
See also: https://stackoverflow.com/a/3964189/2943403 – mickmackusa Jul 15 '22 at 05:36

Check multiple variables (boolean) in PHP

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