What is the purpose of the isset() function in PHP when handling form submissions?

Which attribute of the HTML <form> element specifies the HTTP method to be used when submitting the form data?

A). method

B). action

C). type

D). enctype

How can you prevent SQL injection attacks in PHP?

A). Use prepared statements with parameterized queries.

B). Escape user input using the htmlspecialchars() function.

C). Sanitize user input using the filter_var() function.

D). Validate user input using regular expressions.

What is the purpose of the explode() function in PHP?

A). To split a string into an array based on a specified delimiter.

B). To join array elements into a string using a specified delimiter.

C). To sort an array in ascending order.

D). To merge two or more arrays.

How can you check if a checkbox is checked in PHP when submitted via a form?

A). isset($_POST['checkbox'])

B). $_POST['checkbox'] == 'checked'

C). $_POST['checkbox'] === 'checked'

D). empty($_POST['checkbox'])

Which PHP function is used to sanitize user input to prevent SQL injection attacks?

A). strip_tags()

B). htmlspecialchars()

C). mysql_real_escape_string()

D). trim()

Which PHP function is used to handle file uploads?

A). upload_file()

B). process_upload()

C). handle_upload()

D). move_uploaded_file()

What is the purpose of the htmlspecialchars() function in PHP?

A). To convert HTML entities to their corresponding characters.

B). To remove HTML tags from a string.

C). To encode special characters in HTML format.

D). To decode special characters in HTML format.

Which PHP superglobal array is used to retrieve form data sent with the POST method?

A). $_POST

B). $_GET

C). $_REQUEST

D). $_SERVER

Which function is used to check if a variable is an array in PHP?

A). is_array()

B). check_array()

C). array_check()

D). isArray()

What function is used to validate email addresses in PHP?

A). validate_email()

B). filter_var()

C). check_email()

D). email_validate()