Zend-Technologies 200-550 問題集

質問 1：
What function allows resizing of PHP's file write buffer?
A. set_write_buffer()
B. Change the output_buffering INI setting via ini_set() function
C. stream_set_write_buffer()
D. ob_start()
正解：C

質問 2：
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 $this->a*$x;
};
}
}
$a = new A(2);
$a->mul = function($x) {
return $x*$x;
};
$m = $a->mul();
echo $m(3);
A. 0
B. 9
C. 3
D. 6
正解：D

質問 3：
Is the following code vulnerable to SQL Injection ($mysqli is an instance of the MySQLi class)?
$age = $mysqli->real_escape_string($_GET['age']);
$name = $mysqli->real_escape_string($_GET['name']);
$query = "SELECT * FROM `table` WHERE name LIKE '$name' AND age = $age";
$results = $mysqli->query($query);
A. Yes, because you cannot prevent SQL Injection when using MySQLi
B. Yes, because the $name variable is improperly escaped.
C. No, the code is fully protected from SQL Injection.
D. Yes, because the $age variable is improperly escaped.
E. Yes, because the $name variable and the $age variable is improperly escaped.
正解：D

質問 4：
Consider the following XML code:
<?xml version="1.0" encoding="utf-8"?>
<books>
<book id="1">PHP 5.5 in 42 Hours</book>
<book id="2">Learning PHP 5.5 The Hard Way</book> </books>
Which of the following SimpleXML calls prints the name of the second book? (Let $xml = simplexml_load_file("books.xml"); .) (Choose 2)
A. $c = $xml->children(); echo $c[1];
B. echo $xml->books->book[1];
C. echo $xml->book[1];
D. echo $xml->books->book[2];
E. echo $xml->xpath("/books/book[@id=2]");
正解：A,C

質問 5：
How many elements does the array $matches from the following code contain?
$str = "The cat sat on the roof of their house.";
$matches = preg_split("/(the)/i", $str, -1, PREG_SPLIT_DELIM_CAPTURE);
A. 9
B. 2
C. 3
D. 4
E. 7
正解：E

質問 6：
CORRECT TEXT
What is the output of the following code?
function increment (&$val)
{
return $val + 1; }
$a = 1;
echo increment ($a); echo increment ($a);
正解：
22

質問 7：
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. $date1->diff($date2) < 0
B. $date2 < $date1
C. $date2 > $date1
D. $date1->diff($date2) > 0
正解：C