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// 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
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