Web Security: Common Vulnerabilities And Their Mitigation - Sanitizing input - still not done

The video tutorial discusses preventing cross-site scripting in PHP by using the HTML special chars function to convert special characters into HTML entities, making them safe to render in browsers. It emphasizes the importance of sanitizing user input before storing it in databases and introduces a 'clean' function to perform basic sanitization. The tutorial also covers various PHP functions like trim, strip slashes, and strip_tags to sanitize input effectively.

What is the primary purpose of using HTML special CHARS in PHP?

• To convert special characters into HTML entities for safe rendering

• To enhance the visual appearance of HTML pages

• To increase the speed of PHP scripts

• To add additional security layers to the server

Which of the following characters is converted to '&' by HTML special CHARS?

• Quotation mark (")

• Less than (<)

• Greater than (>)

• Ampersand (&)

Why is it important to sanitize user input before storing it in a database?

• To improve database performance

• To prevent malicious code from being executed

• To ensure data is stored in a consistent format

• To reduce the size of the database

What is the role of the 'clean' function in PHP?

• To encrypt user input for security

• To sanitize user input by removing or neutralizing harmful elements

• To format user input for display

• To compress user input for storage

Which PHP function is used to remove whitespace from the beginning and end of a string?

• strip_tags

• trim

• strip_slashes

• htmlspecialchars

What does the strip_tags function do in PHP?

• It removes all HTML tags from a string

• It encrypts HTML tags for security

• It converts HTML tags to plain text

• It adds HTML tags to a string

How does the strip_slashes function modify a string in PHP?

• It adds slashes to escape special characters

• It removes backslashes from a string

• It replaces single slashes with double slashes

• It converts slashes to backslashes