Unlock PHP Magic: How to Take Input from User in PHP Easily
9 Aug 2025
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Security & Compliance
Explain the purpose of implementing CAPTCHA/reCAPTCHA on login and registration pages. Describe the specific threat (e.g., bot attacks, credential stuffing) that this mechanism is designed to prevent.
Explain the vulnerability of SQL Injection. Describe the mandatory programming technique (e.g., using prepared statements or parameterized queries) that must be used to safely construct database queries and neutralize the threat.
Describe how Rate Limiting protects an application's API endpoints. Define two distinct rate limits (e.g., for login vs. public data retrieval) and explain how exceeding the limit should be handled by the server (e.g., specific HTTP error code).
Outline a basic 5-step Server Hardening Policy for the application hosting server (e.g., Linux OS). Steps should include removing unnecessary software, securing SSH access, and regularly applying OS security patches.
Outline a secure policy for storing user data on the client side (mobile device or browser). Specify which types of data are acceptable for local storage (e.g., user preferences) and which sensitive data must never be stored locally.
Explain the security benefit of implementing HTTP Strict Transport Security (HSTS) on a web application server. Detail the necessary HTTP Header and its purpose in ensuring browsers only communicate via HTTPS.
Explain why Token Revocation is a critical security function in the OAuth 2.0 process. Describe the two scenarios (e.g., user changes password, device theft) that should trigger immediate token revocation by the application server.
Describe the mandatory, secure process for storing user passwords in a database. The process must prohibit storing clear-text passwords and recommend a strong, slow Hashing Algorithm (e.g., bcrypt, Argon2).
Establish a strict Input Validation Policy for all user-submitted data. Define the two primary types of validation (e.g., client-side, server-side) and explain why server-side validation is mandatory for security.
Develop a secure Logging Policy for a production application. List 3 pieces of sensitive information (e.g., passwords, full credit card numbers) that must never be written to application logs, even during debugging.
Describe the two distinct steps required to set up Two-Factor Authentication (2FA) using a time-based one-time password (TOTP). Explain the purpose of the initial QR Code Scan.
Describe the typical OAuth 2.0 Flow when a user signs in to your application using a third-party provider (e.g., Google, Facebook). Detail the purpose of the Access Token and the required communication security (HTTPS).
Describe a secure Session Management policy. Define the ideal session timeout duration for a financial application (e.g., 15 minutes) and explain the technical requirement for destroying the session token upon user logout.
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