php variable scope

Question

i'm confused about the php variable scope. such as:

while(true){
    $var = "yes , it is a test!";
  }
  printf($var)

the $var is defined in while statement scope , how could we get it outside it's scope ? and i can't find explanation on the document .

i wonder how php deal with it's scope .

Answer 1

while is not a function. scope of variable refers to variable inside functions and classes

Answer 2

In PHP, a while loop doesn't create a new scope. So it will be available in the function