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

Consider the following table data and PHP code, and assume that the database supports transactions. What is the outcome?

Table data (table name "users" with primary key "id"):

id name email

1 anna [email protected]

2 betty [email protected]

3 clara [email protected]

5 sue [email protected]

PHP code (assume the PDO connection is correctly established):

$dsn = 'mysql:host=localhost;dbname=exam';

$user = 'username';

$pass = '********';

$pdo = new PDO($dsn, $user, $pass);

try {

$pdo->exec("INSERT INTO users (id, name, email) VALUES (6, 'bill', '[email protected]')"); $pdo>begin();

$pdo->exec("INSERT INTO users (id, name, email) VALUES (7, 'john', '[email protected]')"); throw

new Exception();

} catch (Exception $e) {

$pdo->rollBack();

}

A. The user 'bill' will be inserted, but the user 'john' will not be.

B. Both user 'bill' and user 'john' will be inserted.

C. Neither user 'bill' nor user 'john' will be inserted.

D. The user 'bill' will not be inserted, but the user 'john' will be.

Given the following DateTime objects, what can you use to compare the two dates and indicate that

$date2 is the later of the two dates?

$date1 = new DateTime('2014-02-03');

$date2 = new DateTime('2014-03-02');

A. $date2 > $date1

B. $date2 < $date1

C. $date1->diff($date2) < 0

D. $date1->diff($date2) > 0

What is the output of the following code?

$text = 'This is text';

$text1 = <<<'TEXT'

$text

TEXT;

$text2 = <<

$text1

TEXT; echo "$text2";

A. This is text

B. $text

C. $text1

D. $text2

How can you determine whether a PHP script has already sent cookies to the client?

A. Use $_COOKIE

B. Use the getcookie() function

C. Use the headers_sent() function

D. Use JavaScript to send a second HTTP request

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

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

A. header_add()

B. header()

C. http_set_status()

D. http_response_code()

E. http_header_set()

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();

echo $object->value;

A. 2

B. 1

C. 0

D. 3

E. No Output, PHP will generate an error message.

Which of the following statements is NOT true?

A. Class constants are public

B. Class constants are being inherited

C. Class constants can omit initialization (default to NULL)

D. Class constants can be initialized by const

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

Given the following code, what is correct?

function f(stdClass and$x = NULL) { $x = 42; }

$z = new stdClass; f($z); var_dump($z);

A. Error: Typehints cannot be NULL

B. Error: Typehints cannot be references

C. Result is NULL

D. Result is object of type stdClass

E. Result is 42

Which of the following techniques ensures that a value submitted in a form can only be yes or no ?

A. Use a select list that only lets the user choose between yes and no .

B. Use a hidden input field that has a value of yes or no .

C. Enable the safe_mode configuration directive.

D. None of the above.

How can a SimpleXML object be converted to a DOM object?

A. dom_import_simplexml()

B. dom_export_simplexml()

C. simplexml_import_dom()

D. SimpleXML2Dom()

E. None of the above.

What will be the output of the following code?

$a = array(0, 1, 2 => array(3, 4)); $a[3] = array(4, 5); echo count($a, 1);

A. 4

B. 5

C. 8

D. None of the above

You want to allow your users to submit HTML code in a form, which will then be displayed as real code and not affect your page layout. Which function do you apply to the text, when displaying it? (Choose 2)

A. strip_tags()

B. htmlentities()

C. htmltidy()

D. htmlspecialchars()

E. showhtml()