MCQs On Class 37: Working with XML and JSON
Here are 100 Multiple Choice
Questions (MCQs) based on the concepts of working with XML and JSON in PHP:
XML and
JSON Concepts MCQs
XML
Parsing and Manipulation
1. What is
the PHP function used to load an XML file into an object?
o
a) simplexml_load_string()
o
b) simplexml_load_file()
o
c) json_decode()
o
d) xml_parser()
2. Which PHP
function is used to add a new child element to an existing SimpleXML object?
o
a) addChild()
o
b) simplexml_add()
o
c) addElement()
o
d) createChild()
3. Which of
the following is used to retrieve the XML structure as a string in PHP?
o
a) asXML()
o
b) toXML()
o
c) getXML()
o
d) fetchXML()
4. How do
you access an element in an XML document using SimpleXML in PHP?
o
a) $xml['element']
o
b) $xml->element()
o
c) $xml->element
o
d) $xml['element']()
5. Which
method is used to load an XML string into a SimpleXML object?
o
a) simplexml_load_string()
o
b) loadXML()
o
c) xml_parser()
o
d) loadFromString()
6. What does
simplexml_load_file() return
when the XML file is successfully loaded?
o
a) A PHP array
o
b) A SimpleXML object
o
c) A string
o
d) An XML document
7. Which of
the following is NOT a valid SimpleXML method?
o
a) addChild()
o
b) children()
o
c) asXML()
o
d) fetchXML()
8. How can
you iterate over the elements of an XML document loaded with SimpleXML?
o
a) foreach
o
b) for
o
c) while
o
d) do-while
9. Which of
the following function allows you to convert XML data to an array in PHP?
o
a) xml2array()
o
b) json_encode()
o
c) json_decode()
o
d) simplexml_load_file()
10.
What is the return type of simplexml_load_file()?
o
a) Array
o
b) Object
o
c) Boolean
o
d) String
JSON
Parsing and Manipulation
11.
Which PHP function is used to decode a JSON string
into a PHP variable?
o
a) json_encode()
o
b) json_decode()
o
c) parse_json()
o
d) decode_json()
12.
What is the default behavior of json_decode() when
decoding JSON into an object in PHP?
o
a) Returns an array
o
b) Returns a string
o
c) Returns an object
o
d) Returns a boolean
13.
Which of the following would be the output of json_encode() for an
array array("name"
=> "John", "age" => 25)?
o
a) {"name": "John",
"age": 25}
o
b) ["name": "John",
"age": 25]
o
c) array("name": "John",
"age": 25)
o
d) name="John" age=25
14.
What is the correct way to convert an array to JSON
in PHP?
o
a) json_decode()
o
b) json_encode()
o
c) json_convert()
o
d) array_to_json()
15.
Which function in PHP is used to encode a PHP
variable into a JSON string?
o
a) json_encode()
o
b) json_decode()
o
c) json_encode_object()
o
d) encode_json()
16.
Which of the following is the correct PHP function to
check if a string is valid JSON?
o
a) json_is_valid()
o
b) json_validate()
o
c) json_decode()
o
d) json_last_error()
17.
What will json_decode('{"name":
"Alice"}') return in PHP?
o
a) A PHP array
o
b) A PHP object
o
c) A string
o
d) A boolean
18.
Which PHP function is used to check for any error
after using json_decode()?
o
a) json_last_error()
o
b) json_error()
o
c) json_is_error()
o
d) json_decode_error()
19.
What does json_decode() return when it encounters an
invalid JSON string?
o
a) null
o
b) false
o
c) 0
o
d) empty array
20.
Which of the following JSON data structures is
valid?
o
a) {"name": "John",
"age": 25}
o
b) {name: "John", age: 25}
o
c) ["name": "John",
"age": 25]
o
d) name="John" age=25
Working
with XML and JSON
21.
What is the method used to convert XML data to JSON
in PHP?
o
a) xml_to_json()
o
b) json_encode()
o
c) simplexml_load_file()
o
d) json_decode()
22.
Which PHP function is used to load XML from a
string and convert it to a SimpleXML object?
o
a) simplexml_load_string()
o
b) simplexml_load_file()
o
c) xml_parser()
o
d) xml_load_string()
23.
How would you convert a PHP array to XML format?
o
a) Using json_encode()
o
b) Using array_to_xml()
o
c) Using simplexml_load_string()
o
d) Using simplexml()
24.
What does json_encode() do with objects in PHP?
o
a) Converts them into arrays
o
b) Converts them into JSON strings
o
c) Prints them directly
o
d) Converts them into XML
25.
If you want to access a node with the tag <author> in a
SimpleXML object $xml, how would you do it?
o
a) $xml['author']
o
b) $xml->author
o
c) $xml->children('author')
o
d) $xml->get('author')
26.
Which of the following is the correct function to
load an XML file and parse it into an array?
o
a) simplexml_load_string()
o
b) json_decode()
o
c) xml_to_array()
o
d) json_encode()
27.
What is the return type of json_encode() when
used on an associative array?
o
a) Object
o
b) String
o
c) Boolean
o
d) Array
28.
How can you print out an XML document that is
stored in a SimpleXML object in PHP?
o
a) echo $xml->asXML()
o
b) print($xml->asXML())
o
c) echo $xml
o
d) echo $xml->print()
29.
Which of the following data types can be
successfully encoded into JSON format in PHP?
o
a) Array
o
b) Object
o
c) Integer
o
d) All of the above
30.
How would you extract an attribute from an XML
element using SimpleXML in PHP?
o
a) $element->get('attribute')
o
b) $element->attribute()
o
c) $element->attribute
o
d) $element->getAttribute()
Advanced
XML/JSON Handling
31.
What is the main difference between json_decode() and simplexml_load_file()?
o
a) json_decode() works with XML; simplexml_load_file() works
with JSON.
o
b) json_decode() converts JSON to a PHP variable;
simplexml_load_file() parses
XML data.
o
c) json_decode() is used to encode data; simplexml_load_file() is used
to decode data.
o
d) There is no difference.
32.
When decoding JSON, how can you convert it into an
associative array instead of an object?
o
a) Pass true as the second argument in json_decode().
o
b) Pass false as the second argument in json_decode().
o
c) Use json_parse() instead.
o
d) Use json_assoc().
33.
How do you write an XML element with attributes
using SimpleXML?
o
a) $xml->addChild('tag', 'value', 'attribute')
o
b) $xml->addChild('tag',
'value')->addAttribute('attribute', 'value')
o
c) $xml->createChild('tag', 'value', 'attribute')
o
d) $xml->addTag('tag', 'value', 'attribute')
34.
Which PHP function can be used to get the last
error occurred while decoding JSON?
o
a) json_error()
o
b) json_last_error()
o
c) json_get_error()
o
d) json_error_last()
35.
Which function would you use to convert an XML
object into a JSON object in PHP?
o
a) simplexml_to_json()
o
b) json_encode()
o
c) xml_to_json()
o
d) xml_parse_to_json()
36.
How do you create a valid JSON object in PHP?
o
a) json_encode(["name" =>
"John", "age" => 25])
o
b) json_decode('{"name": "John",
"age": 25}')
o
c) json_parse('{"name": "John",
"age": 25}')
o
d) json_object("name": "John",
"age": 25)
37.
Which of the following will result in an error when
decoding JSON?
o
a) Using json_decode() with valid JSON
o
b) Using json_decode() with malformed JSON
o
c) Using json_decode() with a string containing JSON
o
d) None of the above
38.
How can you print an entire XML document in PHP
after converting it to JSON format?
o
a) echo json_encode($xml)
o
b) echo $xml->asJSON()
o
c) echo json_encode($xml->asXML())
o
d) echo $xml->getJSON()
39.
How would you check if an XML element has
attributes in SimpleXML?
o
a) Use count() on $xml->attributes()
o
b) Use isset() on $xml->attributes()
o
c) Use empty() on $xml->attributes()
o
d) Use checkAttributes() on $xml
40.
Which JSON function in PHP is used to check for
decoding errors?
o
a) json_last_error()
o
b) json_error()
o
c) json_decode_error()
o
d) json_last_error_msg()
Let me know if you'd like
additional MCQs or modifications to the current ones!
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Here are additional Multiple
Choice Questions (MCQs) for working with XML and JSON in PHP:
XML
Parsing and Manipulation (Continued)
41.
Which of the following is the correct method to
remove an element from an XML document using SimpleXML?
- a) $xml->removeChild()
- b) $xml->delete()
- c) $xml->remove()
- d) $xml->children()->unset()
42.
What does the children() method in SimpleXML do?
- a)
Retrieves the children of the current element as an array.
- b)
Retrieves the children as a list of strings.
- c)
Returns the parent element of the current element.
- d)
Lists all the elements in the XML document.
43.
What would be the result of calling simplexml_load_string("<book><title>PHP</title></book>") in PHP?
- a) A
SimpleXML object with one child element
- b)
An array with two elements
- c) A
string "PHP"
- d) A
JSON object with the data
44.
How do you access the text content of an element in
a SimpleXML object?
- a) $xml->element()
- b) $xml->element[0]
- c) $xml->element->value()
- d) $xml->element
45.
What will simplexml_load_string("<person><name>John</name><age>30</age></person>") return?
- a) A
JSON object
- b)
An array
- c) A
SimpleXML object
- d) A
string "John"
46.
Which of the following SimpleXML functions
retrieves an attribute of an element?
- a) getChild()
- b) getAttribute()
- c) getAttributes()
- d) attributes()
47.
What will be the output of the following code?
php
Copy code
$xml =
simplexml_load_string("<person><name>John</name><age>30</age></person>");
echo $xml->name;
- a)
John
- b) name
- c) 30
- d)
Age
48.
How do you handle XML namespaces in SimpleXML?
- a) $xml->namespace->element()
- b) $xml->children('namespace')
- c) $xml->element('namespace')
- d)
SimpleXML doesn't support namespaces.
49.
Which of the following PHP functions is used to
fetch a specific attribute of an XML element?
- a) simplexml_fetch()
- b) simplexml_get()
- c) simplexml_load()
- d) attribute()
50.
Which function converts a SimpleXML object to a
string that can be used as an XML document?
- a) asXML()
- b) getXML()
- c) saveXML()
- d) convertXML()
JSON
Parsing and Manipulation (Continued)
51.
Which PHP function is used to decode JSON into a
PHP object by default?
- a) json_decode()
- b) json_parse()
- c) json_object()
- d) json_string()
52.
What will the following PHP code output?
php
Copy code
$json =
'{"name":"Alice", "age":25}';
$data = json_decode($json, true);
echo $data['name'];
- a)
Alice
- b)
name
- c) 25
- d)
NULL
53.
Which of the following JSON formats is valid in
PHP?
- a) {"name":
"John", "age": 30}
- b) {name:
"John", age: 30}
- c) ["name":
"John", "age": 30]
- d) name="John"
age=30
54.
How do you convert a PHP array back into a JSON
string?
- a) json_encode()
- b) json_decode()
- c) json_array()
- d) array_to_json()
55.
Which function would you use to find the last error
when working with JSON?
- a) json_last_error()
- b) json_get_error()
- c) json_error()
- d) json_last_error_message()
56.
What is the default type returned when you decode
JSON into a PHP variable?
- a)
Array
- b)
Object
- c)
String
- d)
Integer
57.
What does json_decode() return when you pass a malformed
JSON string?
- a) false
- b) null
- c) empty
string
- d) empty
array
58.
Which function would you use to convert JSON data
back into a PHP array?
- a) json_decode($json,
true)
- b) json_decode($json,
false)
- c) json_array_decode($json)
- d) json_to_array($json)
59.
Which of the following is NOT a valid JSON value?
- a)
String
- b)
Integer
- c)
Undefined
- d)
Boolean
60.
How do you handle errors during JSON decoding in
PHP?
- a)
Check json_last_error() after json_decode()
- b)
Use json_error() function
- c)
Check json_error_message() function
- d)
Use try-catch block for JSON decoding errors
Working
with XML and JSON Together
61.
Which PHP function is commonly used to convert JSON
data into XML format?
- a) json_to_xml()
- b) json_decode()
- c) json_encode()
- d) xml_encode()
62.
How do you convert an XML object to a JSON object
using PHP?
- a) json_encode($xml)
- b) xml_to_json($xml)
- c) simplexml_load_file($xml)
- d) convert_xml_to_json($xml)
63.
What does the json_last_error_msg() function do?
- a)
Returns a message for the last error occurred in json_decode()
- b)
Returns the last decoded JSON object
- c)
Checks for a valid JSON format
- d)
Returns the previous error in XML encoding
64.
How would you access a child element named book in XML
using SimpleXML?
- a) $xml->book()
- b) $xml->book
- c) $xml->children('book')
- d) $xml->get('book')
65.
Which method is used to add an attribute to an
element in SimpleXML?
- a) addAttribute()
- b) setAttribute()
- c) addAttr()
- d) createAttribute()
66.
How do you parse an XML file into a SimpleXML
object and convert it to JSON?
- a) json_encode(simplexml_load_file('file.xml'))
- b) simplexml_to_json('file.xml')
- c) xml_parse_to_json('file.xml')
- d) xml_encode_to_json('file.xml')
67.
What would the following PHP code return?
php
Copy code
$xml =
simplexml_load_string("<book><title>PHP</title><author>John</author></book>");
echo json_encode($xml);
- a) A
JSON object representing the XML data
- b) A
JSON string with book data
- c) A
JSON array with title and author as keys
- d)
None of the above
68.
How do you handle large XML documents in PHP to
avoid memory issues?
- a)
Use SimpleXML with large file handling
- b)
Use xml_parser_create()
- c)
Split the XML document into smaller chunks
- d)
Use JSON instead of XML for large datasets
69.
Which PHP function allows you to fetch a JSON
string and convert it to a PHP object?
- a) json_decode()
- b) json_parse()
- c) json_encode()
- d) json_fetch()
70.
How would you access an array in PHP returned by json_decode()?
- a) $data->array['key']
- b) $data['key']
- c) $data->key
- d) $data(key)
Advanced
Topics
71.
What does the json_encode() function do with objects that
have private properties?
- a)
Ignores the private properties
- b)
Converts private properties into public
- c)
Converts them to null
- d)
Throws an error
72.
Which method allows the addition of attributes to
an XML element using SimpleXML in PHP?
- a) addChild()
- b) createAttribute()
- c) addAttribute()
- d) setAttribute()
73.
When working with JSON in PHP, which of the
following would NOT result in a valid JSON object?
- a) {"name":
"John", "age": 25}
- b) {"name":
"John", age: 25}
- c) ["name",
"John", "age", 25]
- d) {"name":
"John"}
74.
Which of the following can be parsed by json_decode() function
in PHP?
- a)
JSON strings
- b)
XML strings
- c)
CSV strings
- d)
Array strings
Let me know if you need further
assistance or more questions!
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Here are additional Multiple
Choice Questions (MCQs) related to working with XML and JSON in PHP:
XML
Parsing and Manipulation (Continued)
75.
What function in PHP is used to convert an XML
object into an array?
- a) xml_to_array()
- b) simplexml_load_string()
- c) json_decode()
- d) simplexml_load_file()
76.
Which of the following functions can be used to
write XML data to a file?
- a) writeXML()
- b) saveXML()
- c) xml_write()
- d) simplexml_save()
77.
What is the result of using simplexml_load_string('<foo><bar>hello</bar></foo>') in PHP?
- a)
An XML string
- b) A
SimpleXML object containing the root element foo
- c)
An array with key foo
- d) A
string hello
78.
In SimpleXML, which method would you use to add a
new child element to an XML node?
- a) addChild()
- b) appendChild()
- c) insertChild()
- d) createChild()
79.
What happens if you try to parse an invalid XML
string using simplexml_load_string()?
- a)
It returns an empty object.
- b)
It throws an exception.
- c)
It returns false.
- d)
It returns null.
80.
Which of the following is a correct way to load an
XML document using SimpleXML?
- a) $xml
= simplexml_load_file("file.xml");
- b) $xml
= loadXML("file.xml");
- c) $xml
= load_file("file.xml");
- d) $xml
= xml_load("file.xml");
81.
Which of the following is a valid way to access an
attribute in a SimpleXML element?
- a) $xml->element->attribute('name')
- b) $xml->element['name']
- c) $xml->attribute('name')
- d) $xml->element->attributes()
82.
How would you get the number of child elements
under a given element in SimpleXML?
- a) $xml->countChildren()
- b) $xml->children()->length()
- c) $xml->children()->count()
- d) $xml->count()
83.
How can you display the name of an XML element
using SimpleXML?
- a) $xml->name()
- b) $xml->getName()
- c) $xml->name
- d) $xml->tagName()
JSON
Parsing and Manipulation (Continued)
84.
Which of the following will correctly encode a PHP
array to a JSON string?
- a) json_encode($array);
- b) json_encode($json);
- c) json_to_string($array);
- d) array_to_json($array);
85.
What does the json_encode() function do when you pass a PHP
object to it?
- a)
Converts it into a JSON string representation.
- b)
Converts it into an array.
- c)
Ignores the object.
- d)
Throws an error.
86.
How would you check if a string is valid JSON in
PHP?
- a)
Using json_is_valid()
- b)
Using json_decode() and checking for errors.
- c)
Using check_json()
- d)
Using validate_json()
87.
What will json_decode('[1, 2, 3]') return
in PHP?
- a) A
JSON object
- b) A
PHP object
- c)
An array
- d) A
string "1,2,3"
88.
What is the default behavior of json_decode() when
decoding JSON into an object?
- a)
It converts JSON objects into PHP arrays.
- b)
It converts JSON objects into PHP objects.
- c)
It throws an error if the JSON is malformed.
- d)
It returns false.
89.
How would you decode a JSON object as an
associative array instead of an object using json_decode()?
- a) json_decode($json,
true);
- b) json_decode($json,
false);
- c) json_decode($json,
array);
- d) json_decode($json,
obj);
90.
What is the output of json_decode('{"name":"Alice"}') in PHP
if you pass true as the second parameter?
- a)
An object with a name property
- b)
An array with a key name
- c) A
string Alice
- d)
An error
91.
Which of the following is a valid JSON array in
PHP?
- a) [1,
2, 3]
- b) {1,
2, 3}
- c) (1,
2, 3)
- d) 1,
2, 3
92.
How can you convert a JSON string back into a PHP
array with numeric keys?
- a) json_decode($json,
true);
- b) json_decode($json,
false);
- c) json_decode($json,
array);
- d) json_decode($json,
numeric);
93.
Which function should be used to get the last error
occurred when working with JSON in PHP?
- a) json_last_error()
- b) json_error()
- c) json_get_error()
- d) json_get_last_error()
94.
How would you represent the following PHP array as
JSON?
php
Copy code
$data = ["name" =>
"John", "age" => 30];
- a) json_encode($data);
- b) json_array($data);
- c) json_string($data);
- d) json_create($data);
95.
What will json_encode(array("name" =>
"John", "age" => 30)) output?
- a) {"name":"John","age":30}
- b) ["name",
"John", "age", 30]
- c) "name":
"John", "age": 30
- d) name:John,
age:30
Working
with XML and JSON Together (Continued)
96.
What does json_encode() return if it is given an invalid
PHP object or array?
- a)
An empty JSON object
- b) A
valid JSON string
- c) false
- d) A
string with an error message
97.
Which of the following would allow you to encode a
SimpleXML object into a JSON string?
- a) json_encode($xml)
- b) xml_to_json($xml)
- c) json_encode($xml->asXML())
- d) simplexml_to_json($xml)
98.
How would you parse an XML document and convert it
to JSON in PHP?
- a) json_encode(simplexml_load_string($xml_string))
- b) simplexml_to_json($xml_string)
- c) xml_to_json($xml_string)
- d) parseXML($xml_string)->toJson()
99.
What is the output when you convert an XML element
to JSON using json_encode() in PHP?
- a) A
JSON string representation of the XML data
- b) A
PHP object with XML data
- c) A
PHP array with keys from the XML
- d)
An empty JSON string
100.
How can you store and exchange structured data
between different systems using PHP?
- a)
Use XML or JSON for data representation
- b)
Store data in plain text format
- c)
Use HTML for data exchange
- d)
Store data in database only
These additional questions should
help further assess students' understanding of working with XML and JSON in
PHP. Let me know if you need any further assistance!