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

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

Which PHP function is used to handle file uploads?

A). upload_file()

B). process_upload()

C). handle_upload()

D). move_uploaded_file()

What function is used to validate email addresses in PHP?

A). validate_email()

B). filter_var()

C). check_email()

D). email_validate()

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.

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

A). To check if a variable is empty

B). To check if a variable is set and is not NULL

C). To check if a variable is numeric

D). To convert a variable to a string

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

A). $_POST

B). $_GET

C). $_REQUEST

D). $_SERVER

Which PHP function is used to redirect the user to another page?

A). redirect()

B). header()

C). forward()

D). location()

How can you access the value of a form field named 'username' submitted via the POST method in PHP?

A). $_GET['username']

B). $_POST['username']

C). $_REQUEST['username']

D). $_SERVER['username']