In the following code, which classes can be instantiated?
abstract class Graphics {
abstract function draw($im, $col);
}
abstract class Point1 extends Graphics {
public $x, $y;
function __construct($x, $y) {
$this->x = $x;
$this->y = $y;
}
function draw($im, $col) {
ImageSetPixel($im, $this->x, $this->y, $col);
}
}
class Point2 extends Point1 { }
abstract class Point3 extends Point2 { }
Which of the following parts must a XML document have in order to be well-formed?
Which of the following may be used in conjunction with CASE inside a SWITCH statement?
After performing the following operations:
$a = array('a', 'b', 'c');
$a = array_keys(array_flip($a));
What will be the value of $a?
What is the name of the key for the element in $_FILES['name'] that contains the provisional name of the uploaded file?
