200-550 Exam Questions

What is the output of the following code? function append($str) { $str = $str.'append'; } function prepend(&$str) { $str = 'prepend'.$str; } $string = 'zce'; append(prepend($string...

How many times will the function counter() be executed in the following code? function counter($start, &$stop) { if ($stop > $start) { return; } counter($start--, ++$stop); } $star...

How do you allow the caller to submit a variable number of arguments to a function?

What will the $array array contain at the end of this script? function modifyArray (&$array) { foreach ($array as &$value) { $value = $value + 1; } $value = $value + 2; } $array =...

What is the output of the following code? class a { public $val; } function renderVal (a $a) { if ($a) { echo $a->val; } } renderVal (null);

What is the output of the following code? function fibonacci (&$x1 = 0, &$x2 = 1) { $result = $x1 + $x2; $x1 = $x2; $x2 = $result; return $result; } for ($i = 0; $i < 10; $i++) { e...

What is the output of the following code? function ratio ($x1 = 10, $x2) { if (isset ($x2)) { return $x2 / $x1; } } echo ratio (0);

Which of the following is NOT a valid function declaration?

Which of the following is true about stream contexts? (Choose 2)

What function can be used to retrieve an array of current options for a stream context?

When retrieving data from URLs, what are valid ways to make sure all file_get_contents calls send a certain user agent string? (Choose 2)

What will an opcode cache ALWAYS automatically improve?

What is cached by an opcode cache?

Which php.ini setting is usually required to use an opcode cache?

What is the output of the following code? var_dump(boolval(-1));

What is the output of the following code? var_dump(boolval([]));

What is the output of the following code? var_dump(boolval(new StdClass()));

Which of the following is NOT true about PHP traits? (Choose 2)

Given the following code, what will the output be: trait MyTrait { private $abc = 1; public function increment() { $this->abc++; } public function getValue() { return $this->abc; }...

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(...

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 */...

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*...

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 stat...

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

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

What is the return value of the following code substr_compare("foobar", "bar", 3);

What function can be used to retrieve an array of current options for a stream context?

What is the difference between "print" and "echo"?

What is the preferred method for preventing SQL injection?

Is the following code vulnerable to SQL Injection ($mysqli is an instance of the MySQLi class)? $age = $mysqli->real_escape_string($_GET['age']); $name = $mysqli->real_escape_strin...

Which of the following does NOT help to protect against session hijacking and fixation attacks?

Which of the following PHP functions can be used to set the HTTP response code? (Choose 2)

What is the name of the header used to require HTTP authentication?

What types of HTTP authentication are supported by PHP? (Choose 2)

Which of the following items in the $_SERVER superglobal are important for authenticating the client when using HTTP Basic authentication? (Choose 2)

When tracking upload progress with sessions, the values of 2 INI settings are needed to determine the key in $_SESSION of the upload progress data. What are the INI settings? (Choo...

What is the name of the function that allows you register a set of functions that implement user- defined session handling?

Which of these databases is NOT supported by a PDO driver?

Which of these statements about PDO is NOT true?

What is the output of the following code? class test { public $value = 0; function test() { $this->value = 1; } function __construct() { $this->value = 2; } } $object = new test();...

Which methods can be used to overload object properties? (Choose 2)

What is the result of the following code? class T { const A = 42 + 1; } echo T::A;

Which of the following statements is NOT true?

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;

Given the following code, what is correct? function f(stdClass &$x = NULL) { $x = 42; } $z = new stdClass; f($z); var_dump($z);

Which of the following statements is NOT correct?

Which of the following statements is correct?

Which of the following statements about exceptions is correct? (Choose 2)

What is the output of the following code? try { class MyException extends Exception {}; try { throw new MyException; } catch (Exception $e) { echo "1:"; throw $e; } catch (MyExcept...

What is the name of the method that can be used to provide read access to virtual properties in a class?