QUESTION: 109

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);

Answer(s): A

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QUESTION: 110

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);

5
10
50
Fatal error

Answer(s): C

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QUESTION: 111

Which of the following statements about anonymous functions in PHP are NOT true? (Choose 2)

Anonymous functions can be bound to objects
Anonymous functions created within object context are always bound to that object
Assigning closure to a property of an object binds it to that object
Methods bind() and bindTo() of the Closure object provide means to create closures with different binding and scope
Binding defines the value of $this and the scope for a closure

Answer(s): B,C

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QUESTION: 112

What will be the result of the following operation?
$a = array_merge([1, 2, 3] + [4=>1, 5, 6]);
echo $a[2];

4
3
2
false
Parse error

Answer(s): B

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