15. Which PHP function is commonly used to validate email addresses submitted through a form?

What is the purpose of input validation in web forms?

A). Ensuring Data Integrity

B). Enhancing User Experience

C). Preventing XSS Attacks

D). Enforcing Password Policies

Which of the following HTTP methods is considered safe and idempotent, making it suitable for form submissions?

A). POST

B). GET

C). PUT

D). DELETE

What is the primary purpose of form data validation in web applications?

A). Enhancing user experience

B). Preventing security vulnerabilities

C). Optimizing server performance

D). Improving search engine ranking

What does XSS stand for in the context of web security?

A). Cross-Site Scripting

B). XML Secure Socket

C). External Server Session

D). Cross-Site Sanitization

Which of the following is a common security vulnerability associated with form data submission?

A). SQL Injection

B). Form Spamming

C). Broken Authentication

D). Clickjacking

Which PHP function is used to generate a random CSRF token for form submissions?

A). bin2hex()

B). uniqid()

C). md5()

D). openssl_random_pseudo_bytes()

Which PHP function is commonly used to check if a form field is empty?

A). empty()

B). isset()

C). is_empty()

D). is_null()

Which HTTP header instructs web browsers to limit the scope of cookies to a specific domain?

A). SameSite

B). Cache-Control

C). Access-Control-Allow-Origin

D). Content-Security-Policy

Which PHP function is commonly used to sanitize input data from a form to prevent XSS attacks?

A). htmlspecialchars()

B). htmlentities()

C). strip_tags()

D). filter_var()

What security measure helps prevent form spamming by distinguishing between human users and bots?

A). CAPTCHA

B). HTTPS

C). CSRF Token

D). Two-Factor Authentication