Summary of php output string method

$v = new test();
print_r($v);
var_dump($v);
class test {
 public $num = 1;
 public $str = "222 ";
 public $bln = true;
 function test() {
 global $num;
 }
}

The result is: test object ( [num] => 1 [str] => 222 [bool] => 1 ) object(test)#1 (3) { ["num"]=> int(1) ["str"]=> string(3) "222" ["bool"]=> bool(true) }