if（（$ x> 0 && 256 <= $ x）||（$ y> 0 && 256 <= $ y））有什么问题？

Question

Whats wrong with

if (($x > 0 && 256 <= $x) || ($y > 0 && 256 <= $y)) { 
//Do AWESOME action here 
} else { 
echo '<br><div align="center"><b>X and Y must be over 0 but equal or less than 256.</b></div>'; 
}

? That means if X is over 0 and X is 256 or less and y is over 0 and less then or equal to 256, to do somthing, right? I put in x 237 and y 144, it gives me a error saying "X and Y must be over 0 but equal or less than 256."

Answer 1

   if (($x > 0 && 256 >= $x) || ($y > 0 && 256 >= $y))

But rather start with $x

   if (($x > 0 && $x <= 256) || ($y > 0 && $y <= 256))

Just like you would say in speech: x is less than or equal to 256.