Which PHP function is used to handle file uploads?

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

A). To remove whitespace from the beginning and end of a string.

B). To truncate a string to a specified length.

C). To convert a string to lowercase.

D). To convert a string to uppercase.

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 function is used to redirect the user to another page?

A). redirect()

B). header()

C). forward()

D). location()

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()

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

A). $_POST

B). $_GET

C). $_REQUEST

D). $_SERVER

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.

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 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 sanitize user input to prevent SQL injection attacks?

A). strip_tags()

B). htmlspecialchars()

C). mysql_real_escape_string()

D). trim()