PHP Security Checklist: Build Hack-Proof Applications (2026)

Security is the most ignored but most important part of PHP development.

This guide gives you a real-world security checklist used in production systems.

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1. Prevent SQL Injection

$stmt = $conn->prepare("SELECT * FROM users WHERE email=?");

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2. Prevent XSS Attacks

echo htmlspecialchars($input, ENT_QUOTES, 'UTF-8');

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3. Secure Password Storage

password_hash($password, PASSWORD_DEFAULT);

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4. Use HTTPS Always

Encrypts data between browser and server.

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5. Secure Sessions

session_regenerate_id(true);

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6. Validate All Input

Never trust user input.

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7. Protect File Uploads

• Check file type

• Limit size

• Rename file