Building Secure PHP Applications in 2026
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Onion Admin
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Introduction
Security is not an afterthought — it is a fundamental part of building robust PHP applications. In 2026, the threat landscape has evolved significantly, and developers must stay ahead of attackers.
1. Always Use PDO with Prepared Statements
SQL injection remains one of the most common vulnerabilities. Always use PDO with prepared statements and never concatenate user input directly into SQL queries.
2. Implement CSRF Protection
Cross-Site Request Forgery (CSRF) attacks can trick authenticated users into performing unwanted actions. Always validate CSRF tokens on state-changing requests.
3. Hash Passwords with password_hash()
Never store plain-text passwords. Use password_hash() with the PASSWORD_BCRYPT or PASSWORD_ARGON2ID algorithm.