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Zend Certified PHP Engineer Questions 106–110 (page: 23)

Given the following code, how can we use both traits A and B in the same class? (select all that apply)
trait A {
public function hello() {
return "hello";
}
public function world() {
return "world";
}
}
trait B {
public function hello() {
return "Hello";
}
public function person($name) {
return ":$name";
}
}

In the following code, which line should be changed so it outputs the number 2:
class A {
protected $x = array(); /* A */
public function getX() { /* B */
return $this->x; /* C */
}
}
$a = new A(); /* D */
array_push($a->getX(), "one");
array_push($a->getX(), "two");
echo count($a->getX());

What is the output of the following code?
class A {
public $a = 1;
public function __construct($a) { $this->a = $a; }
public function mul() {
return function($x) {
return $this->a*$x;
};
}
}
$a = new A(2);
$a->mul = function($x) {
return $x*$x;
};
$m = $a->mul();
echo $m(3);

CORRECT TEXT
What is the output of the following code?
class Number {
private $v = 0;
public function __construct($v) { $this->v = $v; }
public function mul() {
return function ($x) { return $this->v * $x; };
}
}
$one = new Number(1);
$two = new Number(2);
$double = $two->mul()->bindTo($one);
echo $double(5);

What is the output of the following code?
class Number {
private $v;
private static $sv = 10;
public function __construct($v) { $this->v = $v; }
public function mul() {
return static function ($x) {
return isset($this) ? $this->v*$x : self::$sv*$x;
};
}
}
$one = new Number(1);
$two = new Number(2);
$double = $two->mul();
$x = Closure::bind($double, null, 'Number');
echo $x(5);