Zend-Technologies 200-550 問題集

質問 1：
After performing the following operations:
$a = array('a', 'b', 'c');
$a = array_keys(array_flip($a));
What will be the value of $a?
A. array(2, 1, 0)
B. array('c', 'b', 'a')
C. array('a', 'b', 'c')
D. None of the above
正解：C

質問 2：
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 3：
Consider the following code. What can be said about the call to file_get_contents?
$getdata = "foo=bar";
$opts = array('http' =>
array(
'method' => 'POST',
'header' => 'Content-type: application/x-www-form-urlencoded',
'content' => $getdata
)
); $context = stream_context_create($opts);
$result = file_get_contents('http://example.com/submit.php', false, $context);
A. A GET request will be performed on http://example.com/submit.php
B. A POST request will be performed on http://example.com/submit.php
C. An error will be displayed
正解：B

質問 4：
CORRECT TEXT
Which PHP function is used to validate whether the contents of $_FILES['name']['tmp_name'] have really been uploaded via HTTP?
正解：
is_uploaded_file(), is_uploaded_file

質問 5：
You need to escape special characters to use user input inside a regular expression. Which functions would you use? (Choose 2)
A. regex_quote()
B. htmlentities()
C. addslashes()
D. quote_meta()
E. preg_quote()
正解：D,E

質問 6：
What will an opcode cache ALWAYS automatically improve?
A. Running time of a loop in a PHP script
B. Memory footprint of a PHP script
C. Execution speed of a PHP script
D. Efficiency of HTML markup generated by a PHP script
E. None of the above
正解：E

質問 7：
What is the preferred method for preventing SQL injection?
A. Using htmlspecialchars() and the available database-specific escaping functionality to escape variables to be used in a query.
B. Always using the available database-specific escaping functionality on all variables prior to building the SQL query.
C. Using addslashes() to escape variables to be used in a query.
D. Always using prepared statements for all SQL queries.
正解：D