Weird Boolean Behavior

[trevorsg]

Try running the following code:

var_dump(true and !true);
$var = true and !true;
var_dump($var);

 

Was the output the same as what you expected?

 

Now try putting parentheses around the `true and !true` in the second line. The problem is fixed.

 

You can also replace `and` with `&&` and the problem is fixed as well.

 

Is this a bug in PHP? Is the `and` operator purposefully given a weaker precedence than the assignment operator?

 

Any light on this subject would be greatly appreciated. Thanks!

[PFMaBiSmAd]

http://us3.php.net/manual/en/language.operators.precedence.php

[trevorsg]

Ah, I was just looking for that part of the manual, and I couldn't find it. What is the reasoning behind this?

 

Ooh, I just had a thought - it's that way so you can do something like

$blah = doSomething() or die("Can't do something");

 

Ok, makes sense now.