PHP Security
PHP applications face injection attacks, XSS, CSRF, broken authentication, and insecure file handling. Defence is layered: validate input, encode output, use parameterised queries, and keep dependencies updated.
PHP
Beginner
3 min read
PHP Security Overview
Example
// OWASP Top 10 PHP defences:
// 1. Parameterised queries (PDO) — prevents SQL injection
// 2. htmlspecialchars() on output — prevents XSS
// 3. CSRF tokens on forms
// 4. password_hash() / password_verify()
// 5. Validate file uploads (MIME + size)
// 6. Use HTTPS; set secure cookies
// 7. Rate-limit authentication endpoints Pro Tip
Security is not a feature you add at the end — bake each defence into every layer as you build.