This is the second part of the explanation exam questions to test Zend PHP5 with the correct (imho) answers and useful links on manuals.<?php
$var1 = "10 foos";
$var2 = "20 bars";
print ???????;
?>Answer: B, C
http://php.net/manual/en/language.operators.string.php, http://ru.php.net/manual/en/function.implode.php
62. Given the string, which of the following will extract the TLD (top level domain) of „.net“ from the string? (Choose 1 answer)
$var = „john@php.net“;
Answer: E
http://ru.php.net/manual/en/function.substr.php, http://ru.php.net/manual/en/function.strpos.php
63. When comparing two strings, which of the following is acceptable? (Choose 4 answers)
Answer: A, B, C, D
http://ru.php.net/manual/en/function.strcasecmp.php, http://ru.php.net/manual/en/function.strcmp.php and str_compare does not exist.
64. A fingerprint of a string can be determined using which of the following? (Choose 1 answer)
Answer: A
http://ru.php.net/manual/en/function.md5.php
65. Which of the following is the best way to split a string on the „-=-“ pattern? (Choose 1 answer)
Answer: D
http://ru.php.net/manual/en/function.str-split.php, http://ru.php.net/manual/en/function.preg-split.php, http://ru.php.net/manual/en/function.explode.php — but where is comma?
66. What is the output of the following code? (Choose 1 answer)
<?php
$string = "14302";
$string[$string[2]] = "4";
print $string;
?>
Answer: B
67. Which of the following comparisons will evaluate to true? (Choose 3 answers)
Answer: A, C, E
http://www.php.net/manual/en/language.types.type-juggling.php
68. Which function is best suited for removing markup tags from a string? (Choose 1 answer)
Answer: B
http://php.net/manual/en/function.strip-tags.php
69. Identify the best approach to compare to variables in a binary-safe fashion (Choose 1 answer)
Answer: A
http://ru2.php.net/manual/en/function.strcmp.php, http://php.net/manual/en/language.operators.comparison.php
70. Consider the following script, what could be placed in place of ?????? to output the string: I have 5 apples and 10 oranges? (Choose 2 answers)
<?php
$oranges = 10;
$apples = 5;
$string = "I have %d apples and %d oranges";
???????
?>
Answer: E
http://ru.php.net/manual/en/function.sprintf.php
71. Consider the following script, In this script, do the two var_dump() calls produce the same string? Why or Why Not? (Choose 1 answer)
<?php
$string = "<b>I like 'PHP' & I think it is \"cool\"</b>";
var_dump(htmlentities($string, ENT_QUOTES));
var_dump(print htmlspecialchars($string));
?>
Answer: A
http://ru.php.net/manual/en/function.htmlentities.php, http://ru.php.net/manual/en/function.htmlspecialchars.php
72. Consider the following String, which of the following functions would best parse the string above by the tab (\t) and newline (\n) characters? (Choose 1 answer)
$string = „John\tMark\nTed\tLarry“;
Answer: 2
http://ru.php.net/manual/en/function.strtok.php
73. Which functions would be needed to translate the following string: ‘I love PHP 5’ to the following ‘5 PHP EVOL I’? (Choose 2 answers)
Answer: B, E
http://ru.php.net/manual/en/function.strtoupper.php, http://ru.php.net/manual/en/function.strrev.php
74. What is the best approach for converting this string, Into this array? (Choose 1 answer)
$string = „a=10&b[]=20&c=30&d=40+50“;
array(4) {
["a"]=>string(2) „10“
["b"]=>array(1) {
[0]=>string(2) „20“
}
["c"]=>string(2) „30“
["d"]=>string(5) „40 50“
}
Answer: B
http://ru.php.net/manual/en/function.parse-str.php
75. Which string does the following PCRE regular expression match? (Choose 2 answers)
$regex = „/^([a-z]{5})[1-5]+([a-z]+)/“;
Answer: C, D
http://en.wikipedia.org/wiki/Regular_expression
76. Which PCRE regular expression will match the string ‘PhP5-rocks’? (Choose 1 answer)
Answer: A
http://www.phpro.org/tutorials/Introduction-to-PHP-Regex.html#8
77. If regular expressions must be used, in general which type of regular expression functions available to PHP is preferred for performance reasons? (Choose 1 answer)
Answer: B
http://ru.php.net/manual/en/function.ereg.php: preg_match(), which uses a Perl-compatible regular expression syntax, is often a faster alternative to ereg().
78. To destroy one variable within a PHP session you should use which method in PHP 5? (Choose 1 answer)
Answer: D
http://docs.php.net/manual/ru/session.examples.basic.php: Example #2 Unregistering a variable with $_SESSION and register_globals disabled.
79. If you would like to store your session in the database, you would do which of the following? (Choose 1 answer)
Answer: C
http://ru.php.net/manual/en/function.session-set-save-handler.php: This is most useful when a storage method other than those supplied by PHP sessions is preferred. i.e. Storing the session data in a local database.
80. To destroy a PHP session completely, one must which of the following? (Choose 2 answers)
Answer: B, E
http://ru.php.net/manual/en/function.session-destroy.php, and delete the session cookie
81. If you would like to change the session ID generation function, which of the following is the best approach for PHP 5? (Choose 1 answer)
Answer: C
http://ru2.php.net/manual/en/function.session-id.php
82. Consider the following HTML fragement, which of the following name attributes should be used to capture all of the data from the user in PHP? (Choose 1 answer)
<select name=»?????» multiple>
<option value=»1">Item #1</option>
<!— … more options … —>
</select>
Answer: B
http://onlamp.com/pub/a/php/2004/08/26/PHPformhandling.html
83. When uploading a file using HTTP, which variable can be used to locate the file on PHP's local filesystem? (Choose 1 answer)
Answer: B
http://www.php.net/manual/en/features.file-upload.post-method.php:$_FILES['userfile']['tmp_name'] – the temporary filename of the file in which the uploaded file was stored on the server.
84. To force a user to redirect to a new URL from within a PHP 5 script, which of the following should be used? (Choose 1 answer)
Answer:
http://php.net/manual/en/function.header.php, respectively with Location response-header field.
85. Setting a cookie on the client in PHP 5 can be best accomplished by: (Choose 1 answer)
Answer: B
http://ru.php.net/manual/en/function.setcookie.php
86. How does one create a cookie which will exist only until the browser session is terminated? (Choose 1 answer)
Answer: C
http://php.net/manual/en/function.setcookie.php: if expire set to 0, or omitted, the cookie will expire at the end of the session (when the browser closes).
87. Setting a HTTP cookie on the client which is not URL-encoded is done how in PHP 5? (Choose 1 answer)
Answer: A
http://ru.php.net/manual/en/function.setrawcookie.php: setrawcookie() is exactly the same as setcookie() except that the cookie value will not be automatically urlencoded when sent to the browser.
88. During an HTTP authentication, how does one determine the username and password provided by the browser? (Choose 1 answer)
Answer: D
http://php.net/manual/en/features.http-auth.php
89. Consider the following function, what conditional should replace the ????? above? (Choose 1 answer)
<?php
function redirect($url) {
// Check to make sure we haven't already sent
// the header:
if(???????) {
header("Location: $url");
}
}
?>
Answer: A
http://ru.php.net/manual/en/function.headers-list.php, also header_exists is not exists.
90. One can ensure that headers can always be sent from a PHP script by doing what? (Choose 1 answer)
Answer: C
http://php.net/manual/en/function.ob-start.php: while output buffering is active no output is sent from the script (other than headers), instead the output is stored in an internal buffer.
91. When is it acceptable to store sensitive information in an HTTP cookie? (Choose 1 answer)
Answer: C (A)
http://php.net/manual/en/function.setcookie.php — the value of the cookie is stored on the clients computer; do not store sensitive information.
92. Removing undesired markup tags from input can best be done using which function? (Choose 1 answer)
Answer: A
http://ru2.php.net/manual/en/function.strip-tags.php — strip HTML and PHP tags from a string.
93. When using a function such as strip_tags, are markup-based attacks still possible? (Choose 1 answer)
Answer: C
http://ru2.php.net/manual/en/function.strip-tags.php — This function does not modify any attributes on the tags that you allow using allowable_tags, including the style and onmouseover attributes that a mischievous user may abuse when posting text that will be shown to other users.
94. Consider the following PHP string representing an SQL statement. Which of the following values for $username or $password would change the behavior of this query when executed? (Choose 1 answer)
$query = «UPDATE users SET password='$password' WHERE username='$username'»;
Answer: C
http://php.net/manual/en/security.database.sql-injection.php — It is common technique to force the SQL parser to ignore the rest of the query written by the developer with — which is the comment sign in SQL.
95. SQL Injections can be best prevented using which of the following database technologies? (Choose 1 answer)
Answer: B
http://php.net/manual/en/pdo.prepared-statements.php — If an application exclusively uses prepared statements, the developer can be sure that no SQL injection will occur (however, if other portions of the query are being built up with unescaped input, SQL injection is still possible).
96. Where should indirectly executed PHP scripts (i.e. include files) be stored in the file system? (Choose 1 answer)
Answer: A
http://phpsec.org/projects/guide/3.html: Remember that everything within document root has a URL associated with it. For example, if document root is /usr/local/apache/htdocs, then a file located at /usr/local/apache/htdocs/inc/db.inc has a URL such as http://example.org/inc/db.inc.
97. When executing system commands from PHP, what should one do to keep applications secure? (Choose 3 answers)
Answer: B, C, D (?)
http://ru.php.net/manual/en/function.exec.php: When allowing user-supplied data to be passed to this function, use escapeshellarg() or escapeshellcmd() to ensure that users cannot trick the system into executing arbitrary commands.
98. Why is it important from a security perspective to never display PHP error messages directly to the end user, yet always log them? (Choose 2 answers)
Answer: D, E (A)
http://www.w3schools.com/php/php_error.asp
99. The MVC pattern in Web development involves which of the following components? (Choose 4 answers)
Answer: D, A, B (-C)
http://en.wikipedia.org/wiki/Model–view–controller
100. Which of the following aspects of the MVC pattern is used in conjunction with the database? (Choose 1 answer)
Answer: A
http://en.wikipedia.org/wiki/Model–view–controller: the 'model' in MVC is both the data and the business/domain logic needed to manipulate the data in the application.
101. What are the primary benefits of object oriented programming? (Choose 3 answers)
Answer: A, C, D
http://en.wikipedia.org/wiki/Object-oriented_programming#cite_ref-realisticcodereuse_23-0: OOP was developed to increase the reusability and maintainability of source code.[24], and of course Encapsulation.
102. What constitutes a View in the MVC pattern for PHP 5, in the following list? (Choose 2 answers)
Answer: D, E
http://en.wikipedia.org/wiki/Model–view–controller#Concepts: The view renders the model into a form suitable for interaction, typically a user interface element.
103. Which of the following extensions are no longer part of PHP 5 and have been moved to PECL? (Choose 2 answers)
Answer: C, E
http://ru.php.net/manual/en/intro.w32api.php & http://ru.php.net/manual/en/intro.dio.php: This extension has been moved to the » PECL repository and is no longer bundled with PHP as of PHP 5.1.0.
104. Which of the following functions were added to PHP 5 for dealing with arrays? (Choose 2 answers)
Answer: A, C
http://ru.php.net/manual/en/function.array-intersect-key.php & http://ru.php.net/manual/en/function.array-diff-key.php: (PHP 5 >= 5.1.0)
105. Consider the following script. This code has changed behavior in PHP 5. Identify the output of this script as it would have been in PHP 4, as well as the new behavior in PHP 5. (Choose 2 answers)
<?php
function func(&$arraykey) {
return $arraykey; // function returns by value!
}
$array = array('a', 'b', 'c');
foreach (array_keys($array) as $key) {
$y = &func($array[$key]);
$z[] =& $y;
}
var_dump($z);
?>
Answer: B, D
http://www.php.net/manual/en/language.references.return.php & http://php.net/manual/en/functions.returning-values.php
106. Consider the following code block. This code block's behavior has changed between PHP 4 and PHP 5. Why? (Choose 1 answer)
<?php
function &myFunction() {
$string = "MyString";
var_dump($string);
return ($undefined);
}
for($i = 0; $i < 10; $i++) {
$retval = myFunction();
}
?>
Answer: A
http://php.net/manual/en/function.return.php: You should never use parentheses around your return variable when returning by reference, as this will not work.
107. When migrating the following code from PHP 4 to PHP 5, what should be changed? (Choose 2 answers)
<?php
class MyClass {
function MyClass($param) {
/* Do something with $param */
$this->_doSomething($param);
}
// Private method to MyClass
function _doSomething($param) {
/* Do something with $param */
}
}
class AnotherClass extends MyClass {
var $param = "foo";
function AnotherClass() {
parent::MyClass($this->param);
}
}
?>
Answer: A, B
http://php.net/manual/en/language.oop5.decon.php: For backwards compatibility, if PHP 5 cannot find a __construct() function for a given class, it will search for the old-style constructor function, by the name of the class. Effectively, it means that the only case that would have compatibility issues is if the class had a method named __construct() which was used for different semantics. And http://devzone.zend.com/article/1714#Heading4 about Access modifiers in PHP 5.
108. Assuming every method call below returns an instance of an object, how can the following be re-written in PHP 5? (Choose 1 answer)
<?php
$a = new MyClass();
$b = $a->getInstance();
$c = $b->doSomething();
?>
Answer: C
What the link?
109. How can the following code be re-written from PHP 4 to PHP 5? (Choose 1 answer)
<?php
if(get_class($myObj) == "MyClass") {
// Do something
}
?>
Answer: E
http://php.net/manual/en/internals2.opcodes.instanceof.php
110. Is this code valid only in PHP 4, in PHP 5, or both? (Choose 1 answer)
<?php
function myfunction(&$myvalue = null) {
/* ... */
}
?>
Answer: B
http://php.net/manual/en/functions.arguments.php: As of PHP 5, default values may be passed by reference.
