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2021 Sep 200-550 practice test
Q131. The XML document below has been parsed into $xml via SimpleXML. How can the value of <foo> tag accessed?
<?xml version='1.0'?>
<document>
<bar>
<foo>Value</foo>
</bar>
</document>
A. $xml->bar['foo']
B. $xml->bar->foo
C. $xml['document']['bar']['foo']
D. $xml->document->bar->foo
E. $xml->getElementByName('foo');
Answer: B
Q132. Which class of HTTP status codes is used for redirections?
A. 2XX
B. 3XX
C. 4XX
D. 5XX
Answer: B
Q133. Which of the following code snippets is correct? (Choose 2)
A. interface Drawable { abstract function draw();
}
B. interface Point { function getX(); function getY();
}
C. interface Line extends Point { function getX2();
function getY2();
}
D. interface Circle implements Point { function getRadius();
}
Answer: B,C
Q134. Which sentence describes the following regular expression match? preg_match('/^\d+(?:\.[0-9]+)?$/', $test);
A. It matches float numbers with thousand seperators.
B. It matches float numbers without thousand seperators.
C. It matches binary integer numbers.
D. It matches any string.
E. It does not match anything
Answer: B
Q135. Which string will be returned by the following function call?
$test = '/etc/conf.d/wireless'
substr($test, strrpos($test, '/')); // note that strrpos() is being called, and not strpos()
A. ""
B. "/wireless"
C. "wireless"
D. "/conf.d/wireless"
E. "/etc"
Answer: B
Refresh 200-550 actual test:
Q136. How should class MyObject be defined for the following code to work properly? Assume
$array is an array and MyObject is a user-defined class.
$obj = new MyObject(); array_walk($array, $obj);
A. MyObject should extend class Closure
B. MyObject should implement interface Callable
C. MyObject should implement method call
D. MyObject should implement method invoke
Answer: D
Q137. One common security risk is exposing error messages directly in the browser. Which PHP configuration directive can be disabled to prevent this?
A. html_display
B. error_reporting
C. display_errors
D. error_log
E. ignore_repeated_errors
Answer: C
Q138. Which of these statements about PDO is NOT true?
A. PDO has built-in support for Large Objects (LOBs).
B. Placeholders within PDO prepared statements need to be named.
C. When something goes wrong, PDO can throw an instance of its own exception class.
D. PDO does not emulate missing database features.
Answer: B
Q139. 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.
Answer: A
Q140. Which methods can be used to overload object properties? (Choose 2)
A. set(), get()
B. set(), get()
C. put(), receive(), exists()
D. set(), get(), isset()
E. isset(), unset()
Answer: B,E