MCQs On Class 24: PHP and JavaScript Integration
Here’s a set of 100 multiple-choice questions (MCQs) focused on PHP and JavaScript integration, covering various aspects such as data passing, AJAX, session management, and client-server interaction.
PHP and JavaScript Integration MCQs
1. What is the primary purpose of using PHP with JavaScript?
o A) To create static websites
o B) To allow server-side and client-side interaction
o C) To enhance CSS styling
o D) To create database queries
Answer: B
2. Which function in JavaScript is used to make asynchronous requests to the server?
o A) send()
o B) request()
o C) fetch()
o D) async()
Answer: C
3. What method is commonly used to send data from JavaScript to a PHP script using AJAX?
o A) GET
o B) POST
o C) PUT
o D) DELETE
Answer: B
4. In PHP, how do you start a session?
o A) session_start();
o B) start_session();
o C) begin_session();
o D) initiate_session();
Answer: A
5. Which of the following is true about the $_POST superglobal in PHP?
o A) It stores data sent through GET requests.
o B) It stores data sent through POST requests.
o C) It can only store string data.
o D) It is used for file uploads only.
Answer: B
6. What is the output of echo htmlspecialchars("<b>Hello</b>"); in PHP?
o A) <b>Hello</b>
o B) <b>Hello</b>
o C) <Hello>
o D) Hello
Answer: B
7. What is AJAX an acronym for?
o A) Asynchronous JavaScript and XML
o B) Asynchronous Java and XHTML
o C) Automated JavaScript and XML
o D) Advanced Java and XML
Answer: A
8. Which of the following JavaScript methods is used to convert an object to a JSON string?
o A) JSON.parse()
o B) JSON.stringify()
o C) JSON.toString()
o D) JSON.convert()
Answer: B
9. What does the fetch() function return in JavaScript?
o A) A string
o B) An XML document
o C) A Promise
o D) An object
Answer: C
10. Which PHP function is used to retrieve session variables?
o A) get_session()
o B) session_get()
o C) $_SESSION[]
o D) session_retrieve()
Answer: C
11. How do you define a variable in PHP?
o A) var $variable;
o B) $variable;
o C) define $variable;
o D) variable = $value;
Answer: B
12. Which of the following is a method for passing data from JavaScript to PHP?
o A) Using URL parameters
o B) Using cookies
o C) Using local storage
o D) All of the above
Answer: D
13. Which of the following HTTP methods is NOT supported by AJAX?
o A) GET
o B) POST
o C) PATCH
o D) REMOVE
Answer: D
14. What does the json_encode() function do in PHP?
o A) Converts a JSON string to a PHP object
o B) Encodes a PHP variable into a JSON format
o C) Decodes a JSON string
o D) None of the above
Answer: B
15. In JavaScript, which operator is used to assign a value to a variable?
o A) :
o B) =
o C) ==
o D) =>
Answer: B
16. What is the correct way to handle errors in a Promise in JavaScript?
o A) .catch()
o B) .error()
o C) .finally()
o D) .then()
Answer: A
17. Which PHP function is used to retrieve data from a form submitted via POST method?
o A) $_GET
o B) $_POST
o C) $_FORM
o D) $_REQUEST
Answer: B
18. What is the purpose of using htmlspecialchars() in PHP?
o A) To format HTML strings
o B) To escape special characters in HTML
o C) To validate HTML documents
o D) To convert HTML to plain text
Answer: B
19. How can you create a JavaScript function that is triggered by a button click?
o A) By using an onclick event
o B) By using a load event
o C) By using a change event
o D) By using a keypress event
Answer: A
20. What data type does JSON.stringify() return?
o A) JSON
o B) String
o C) Object
o D) Array
Answer: B
21. Which of the following methods can be used to store user data persistently in a web application?
o A) Local Storage
o B) Cookies
o C) Session Storage
o D) All of the above
Answer: D
22. Which method would you use to send an HTTP request to a PHP server-side script?
o A) GET
o B) AJAX
o C) POST
o D) Both B and C
Answer: D
23. What does the session_destroy() function do in PHP?
o A) It removes all session variables
o B) It destroys the entire session
o C) It deletes a specific session variable
o D) It starts a new session
Answer: B
24. Which of the following is true about AJAX?
o A) It can only be used with JavaScript.
o B) It allows web pages to update asynchronously.
o C) It requires a full page reload to update content.
o D) It is a server-side technology.
Answer: B
25. What does the console.log() function do in JavaScript?
o A) Outputs data to the console
o B) Writes data to the webpage
o C) Stores data in a variable
o D) None of the above
Answer: A
26. In PHP, what does the include() function do?
o A) Executes a specified file
o B) Adds the contents of one PHP file to another
o C) Includes external scripts
o D) Both A and B
Answer: D
27. Which event is triggered when an XMLHttpRequest is completed?
o A) onLoad
o B) onComplete
o C) onFinished
o D) onRequest
Answer: A
28. How do you access a session variable named username in PHP?
o A) session['username']
o B) $_SESSION['username']
o C) get_session('username')
o D) $_SESSION.username
Answer: B
29. Which method is NOT valid for making AJAX requests?
o A) XMLHttpRequest
o B) fetch()
o C) jQuery's $.ajax()
o D) getJSON()
Answer: D
30. What will be the output of echo json_encode(["name" => "John", "age" => 30]); in PHP?
o A) {"name": "John", "age": 30}
o B) "name: John, age: 30"
o C) ["name": "John", "age": 30]
o D) {"name": "John", "age": "30"}
Answer: A
31. In JavaScript, which method is used to parse a JSON string?
o A) JSON.parse()
o B) JSON.stringify()
o C) JSON.decode()
o D) JSON.convert()
Answer: A
32. Which of the following is a valid way to declare a variable in JavaScript?
o A) variable x = 5;
o B) var x = 5;
o C) declare x = 5;
o D) x := 5;
Answer: B
33. What will the following PHP code output? echo (5 + 5);
o A) 10
o B) "10"
o C) 5 + 5
o D) Error
Answer: A
34. What is the default HTTP method used by fetch()?
o A) GET
o B) POST
o C) PUT
o D) DELETE
Answer: A
35. In a web application, where would you typically use AJAX?
o A) To load new content without refreshing the page
o B) To send data to the server asynchronously
o C) To retrieve data from the server without a full page reload
o D) All of the above
Answer: D
36. What does the alert() function do in JavaScript?
o A) Sends a message to the server
o B) Displays an alert dialog with a specified message
o C) Writes a message to the console
o D) Logs errors in the application
Answer: B
37. Which function is used to start a session in PHP?
o A) session_start()
o B) start_session()
o C) begin_session()
o D) session_begin()
Answer: A
38. Which statement correctly initializes a session variable in PHP?
o A) $_SESSION['user'] = "John";
o B) session['user'] = "John";
o C) initialize_session('user', 'John');
o D) set_session('user', 'John');
Answer: A
39. What is the purpose of the onreadystatechange property in XMLHttpRequest?
o A) To check if the request is completed
o B) To store the response data
o C) To set the request URL
o D) To send the request
Answer: A
40. Which of the following can be used to send data to a PHP file asynchronously?
o A) Form submission
o B) XMLHttpRequest
o C) redirect()
o D) PHP's header() function
Answer: B
41. What is the correct way to create an AJAX request in JavaScript using XMLHttpRequest?
o A) var request = new XMLHttpRequest(); request.send();
o B) var request = XMLHttpRequest(); request.open();
o C) var request = new XMLHttpRequest(); request.open('GET', 'file.php', true);
o D) var request = XMLHttpRequest(); request.send('file.php');
Answer: C
42. How can you set a cookie in PHP?
o A) setcookie("name", "value");
o B) cookie_set("name", "value");
o C) addcookie("name", "value");
o D) create_cookie("name", "value");
Answer: A
43. In PHP, which array holds the information from form inputs?
o A) $_REQUEST
o B) $_GET
o C) $_POST
o D) All of the above
Answer: D
44. How can you pass variables from JavaScript to PHP without refreshing the page?
o A) Using AJAX
o B) Using a form
o C) Using a link
o D) All of the above
Answer: A
45. What is the output of json_decode('{"name":"John"}'); in PHP?
o A) "name": "John"
o B) An object
o C) An array
o D) Error
Answer: B
46. What is the purpose of the $.ajax() function in jQuery?
o A) To create a new HTML element
o B) To make AJAX requests
o C) To manipulate CSS styles
o D) To validate forms
Answer: B
47. Which of the following is NOT a valid way to create a function in JavaScript?
o A) function myFunction() {}
o B) var myFunction = function() {};
o C) const myFunction = () => {};
o D) create myFunction() {}
Answer: D
48. How do you access the first element of an array in JavaScript?
o A) array[0]
o B) array(1)
o C) array.first()
o D) array.first
Answer: A
49. What does the $.get() method do in jQuery?
o A) Sends a GET request to the server
o B) Retrieves data from a form
o C) Sends a POST request to the server
o D) None of the above
Answer: A
50. Which of the following is used to format the response from the server in JSON format?
o A) json_format()
o B) json_encode()
o C) json_stringify()
o D) json_response()
Answer: B
51. In PHP, which function is used to end a session?
o A) session_end()
o B) session_destroy()
o C) end_session()
o D) close_session()
Answer: B
52. What does $.post() do in jQuery?
o A) Sends a POST request to the server
o B) Sends a GET request to the server
o C) Makes a synchronous request
o D) None of the above
Answer: A
53. How do you get the current date in PHP?
o A) date('Y-m-d');
o B) now();
o C) get_current_date();
o D) current_date();
Answer: A
54. Which property of XMLHttpRequest indicates the status of the request?
o A) status
o B) state
o C) readyState
o D) responseStatus
Answer: A
55. What does the setTimeout() function do in JavaScript?
o A) Delays a function execution for a specified time
o B) Stops a function from executing
o C) Executes a function immediately
o D) None of the above
Answer: A
56. In PHP, which function is used to get the current session ID?
o A) session_id()
o B) get_session_id()
o C) current_session()
o D) id_session()
Answer: A
57. Which of the following is a common way to handle AJAX responses in JavaScript?
o A) By using the then() method of Promises
o B) By using the success() method in jQuery
o C) By using callback functions
o D) All of the above
Answer: D
58. What does the unshift() method do in JavaScript?
o A) Adds an element to the beginning of an array
o B) Removes the first element from an array
o C) Sorts an array
o D) Reverses an array
Answer: A
59. Which HTTP status code indicates a successful request?
o A) 404
o B) 500
o C) 200
o D) 301
Answer: C
60. What does the JSON.parse() function do?
o A) Converts a JavaScript object to JSON
o B) Converts a JSON string to a JavaScript object
o C) Converts a JSON array to a JavaScript array
o D) None of the above
Answer: B
61. In PHP, what does the $_SESSION['var'] syntax refer to?
o A) A variable defined globally
o B) A session variable
o C) A local variable
o D) An environment variable
Answer: B
62. What is the purpose of window.onload in JavaScript?
o A) To run code after the document is fully loaded
o B) To run code before the document is loaded
o C) To handle errors
o D) To store data in local storage
Answer: A
63. Which of the following is NOT a valid way to create an object in JavaScript?
o A) var obj = {};
o B) var obj = new Object();
o C) var obj = Object.create();
o D) var obj = {key: "value"};
Answer: C
64. What does the echo statement do in PHP?
o A) Outputs one or more strings
o B) Accepts user input
o C) Defines a function
o D) Loops through an array
Answer: A
65. Which of the following functions can be used to check if a session is active in PHP?
o A) is_session_active()
o B) session_status() === PHP_SESSION_ACTIVE
o C) session_check()
o D) check_session()
Answer: B
66. What does the onerror event handler do in JavaScript?
o A) Handles successful requests
o B) Handles errors in the request
o C) Prevents the request from being sent
o D) Closes the request
Answer: B
67. How do you prevent form submission in JavaScript?
o A) event.stopPropagation()
o B) event.preventDefault()
o C) return false;
o D) Both B and C
Answer: D
68. What is the purpose of document.getElementById() in JavaScript?
o A) To create a new HTML element
o B) To select an element by its ID
o C) To delete an element
o D) To change the style of an element
Answer: B
69. In PHP, which function is used to redirect to another page?
o A) redirect_page()
o B) header('Location: newpage.php');
o C) go_to('newpage.php');
o D) move_to('newpage.php');
Answer: B
70. What is the output of typeof "Hello" in JavaScript?
o A) string
o B) text
o C) String
o D) object
Answer: A
71. How can you remove an item from an array in JavaScript?
o A) array.remove(item)
o B) delete array[item]
o C) array.splice(index, 1)
o D) Both B and C
Answer: D
72. What does the session_destroy() function do in PHP?
o A) Deletes all session variables
o B) Ends the current session
o C) Initializes a session
o D) Closes the browser
Answer: B
73. What will happen if you try to access a non-existing property of an object in JavaScript?
o A) Returns null
o B) Returns undefined
o C) Throws an error
o D) Returns 0
Answer: B
74. In PHP, which function is used to start output buffering?
o A) ob_start()
o B) start_buffer()
o C) output_buffer()
o D) buffer_on()
Answer: A
75. Which of the following is used to make a POST request using Fetch API?
o A) fetch('url', { method: 'GET' })
o B) fetch('url', { method: 'POST' })
o C) fetch('url', { type: 'POST' })
o D) fetch('url', { requestType: 'POST' })
Answer: B
76. What does the length property of an array return in JavaScript?
o A) The number of elements in the array
o B) The size of the array in bytes
o C) The highest index of the array
o D) None of the above
Answer: A
77. How can you check if a session variable is set in PHP?
o A) isset($_SESSION['var'])
o B) check($_SESSION['var'])
o C) exists($_SESSION['var'])
o D) is_set($_SESSION['var'])
Answer: A
78. Which of the following methods is used to send an AJAX request using jQuery?
o A) $.request()
o B) $.ajax()
o C) $.send()
o D) $.post()
Answer: B
79. What does the splice() method do in JavaScript?
o A) Adds or removes items from an array
o B) Sorts an array
o C) Finds the index of an item
o D) Reverses an array
Answer: A
80. How can you retrieve a cookie in PHP?
o A) $_COOKIE['name']
o B) getcookie('name')
o C) retrieve_cookie('name')
o D) fetch_cookie('name')
Answer: A
81. What is the default method for a form submission?
o A) GET
o B) POST
o C) PUT
o D) DELETE
Answer: A
82. Which of the following is a valid JavaScript array?
o A) var arr = [1, 2, 3];
o B) var arr = {1, 2, 3};
o C) var arr = (1, 2, 3);
o D) var arr = <1, 2, 3>;
Answer: A
83. What does the JSON.stringify() method do?
o A) Converts a JavaScript object to a JSON string
o B) Parses a JSON string to a JavaScript object
o C) Validates a JSON string
o D) None of the above
Answer: A
84. How can you get the value of an input field in JavaScript?
o A) document.getElementById('input').value
o B) document.getElementById('input').text
o C) document.getElementById('input').getValue()
o D) document.getElementById('input').valueOf()
Answer: A
85. Which method is used to remove the last element from an array in JavaScript?
o A) pop()
o B) delete()
o C) remove()
o D) shift()
Answer: A
86. What is the purpose of the header() function in PHP?
o A) To create a new page
o B) To send raw HTTP headers
o C) To add metadata to a page
o D) To end the current script
Answer: B
87. Which JavaScript method is used to round a number to the nearest integer?
o A) round()
o B) Math.round()
o C) Math.ceil()
o D) Math.floor()
Answer: B
88. What does the $.ajaxSetup() method do in jQuery?
o A) Sets default values for future AJAX requests
o B) Initializes AJAX requests
o C) Stops all AJAX requests
o D) None of the above
Answer: A
89. What is the correct syntax for creating an anonymous function in JavaScript?
o A) function() {}
o B) function name() {}
o C) const name = function() {};
o D) Both A and C
Answer: D
90. How can you create a session variable in PHP?
o A) session_create('var', 'value');
o B) $_SESSION['var'] = 'value';
o C) create_session('var', 'value');
o D) set_session('var', 'value');
Answer: B
91. Which operator is used to concatenate strings in PHP?
o A) +
o B) &
o C) .
o D) ,
Answer: C
92. What does the indexOf() method do in JavaScript?
o A) Returns the index of the first occurrence of a specified value
o B) Returns the last index of a specified value
o C) Removes the specified value from an array
o D) Adds a new value to an array
Answer: A
93. How can you prevent a page from refreshing after form submission in JavaScript?
o A) return false;
o B) event.preventDefault();
o C) Both A and B
o D) setTimeout();
Answer: C
94. In PHP, what does the session_regenerate_id() function do?
o A) Changes the session ID
o B) Ends the current session
o C) Starts a new session
o D) Deletes session data
Answer: A
95. Which jQuery method is used to retrieve data from a server asynchronously?
o A) $.get()
o B) $.post()
o C) $.ajax()
o D) All of the above
Answer: D
96. What is the purpose of the setInterval() function in JavaScript?
o A) Executes a function after a specified number of milliseconds
o B) Executes a function repeatedly after a specified interval
o C) Stops a function from executing
o D) None of the above
Answer: B
97. How can you check if a variable is an array in PHP?
o A) is_array($var);
o B) check_array($var);
o C) type_of($var);
o D) var_is_array($var);
Answer: A
98. What does the getElementsByClassName() method return in JavaScript?
o A) A single element with the specified class
o B) An array of elements with the specified class
o C) A string with the class name
o D) None of the above
Answer: B
99. How do you create a new cookie in JavaScript?
o A) document.cookie = "name=value";
o B) create_cookie("name=value");
o C) set_cookie("name=value");
o D) cookie_set("name=value");
Answer: A
100. What is the output of console.log(typeof null); in JavaScript? - A) object - B) null - C) undefined - D) error
**Answer:** A