$x = true and false; var_dump($x);
This one is interesting. In PHP, you can use
and to do a logical comparison.
However, due to the Operator Precedence rules,
and actually has lower precedence than
&& has higher!
That means that the value of $x will be true.
Two ways to fix this:
$x = (true and false); // evaluates to false
$x = true && false; // evaluates to false