PHP: bool vs boolean type hinting

     

I've been trying to use type hinting more in PHP. Today I was writing a function that takes a boolean with a default parameter and I noticed that a function of the form


function foo(boolean $bar = false) {   var_dump($bar);  }  

actually throws a fatal error:


  

Default value for parameters with a class type hint can only be NULL

  

While a function of the similar form


function foo(bool $bar = false) {   var_dump($bar);  }  

does not. However both


var_dump((bool) $bar);  var_dump((boolean) $bar);  

give the exact same output


  

:boolean false

  

Why is this? Is this similar to the wrapper classes in Java?

  
"
answer1
  
  

http://php.net/manual/en/functions.arguments.php#functions.arguments.type-declaration


  

Warning
   Aliases for the above scalar types are not supported. Instead