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PHP still works for real web apps. Poor code makes apps slow. Good structure makes apps secure.
Stop writing everything from scratch. Use a framework. Frameworks handle routing and security. Try these:
- Laravel
- Symfony
- CodeIgniter
Keep your files clean. Do not mix HTML and logic. Separate your routes and controllers. This makes debugging easy.
Secure your database. Do not put user input into SQL queries. Use prepared statements. This stops SQL injection.
Protect passwords. Never store passwords in plain text. Use password_hash. Avoid MD5 and SHA1.
Filter your data. Treat all input as untrusted. Validate forms. Use htmlspecialchars for output. This stops XSS attacks.
Fix session security. Set secure cookie parameters. Regenerate session IDs after login. Add CSRF tokens to your forms.