200-550 Online Practice Questions and Answers
What is "instanceof" an example of?
A. a boolean
B. an operator
C. a function
D. a language construct
E. a class magic
How should you track errors on your production website?
A. Enabling display_errors
B. Enabling log_errors
C. Having a site-wide exception handler
D. Setting error_reporting to E_ALL and ~E_NOTICE
Which of the following will NOT instantiate a DateTime object with the current timestamp?
A. $date = new DateTime();
B. $date = new DateTime('@' . time());
C. $date = new DateTime('now');
D. $date = new DateTime(time());
What will the $array array contain at the end of this script?
function modifyArray (and$array)
{
foreach ($array as and$value)
{
$value = $value + 1;
}
$value = $value + 2;
}
$array = array (1, 2, 3);
modifyArray($array);
A. 2, 3, 4
B. 2, 3, 6
C. 4, 5, 6
D. 1, 2, 3
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);
A. 5
B. 10
C. 50
D. Fatal error
What is the result of the following code?
define('PI', 3.14); class T { const PI = PI; } class Math { const PI = T::PI; } echo Math::PI;
A. Parse error
B. 3.14
C. PI
D. T::PI
Consider the following XML code:
Which of the following SimpleXML calls prints the name of the second book? (Let $xml =
simplexml_load_file("books.xml"); .) (Choose 2)
A. echo $xml->books->book[2];
B. echo $xml->books->book[1];
C. echo $xml->book[1];
D. echo $xml->xpath("/books/book[@id=2]");
E. $c = $xml->children(); echo $c[1];
What DOM method is used to load HTML files?
A. load()
B. loadXML()
C. loadHTML()
D. loadHTMLFile()
What will be the output value of the following code?
$array = array(1,2,3); while (list(,$v) = each($array)); var_dump(current($array));
A. bool(false)
B. int(3)
C. int(1)
D. NULL
E. Array
Consider the following code:
$result = $value1 ??? $value2;
Which operator needs to be used instead of ??? so that $result equals $value1 if $value1 evaluates to true, and equals $value2 otherwise? Just state the operator as it would be required in the code.