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There are several ways to prevent SQL injection in PHP:

1. Use prepared statements with parameterized queries: This is the most effective way to prevent SQL injection. Prepared statements separate the SQL query from the user input, making it impossible for an attacker to inject malicious code.

2. Use PDO (PHP Data Objects) or MySQLi extension: These extensions provide a secure way to interact with databases and support prepared statements.

3. Validate and sanitize user input: Validate and sanitize all user input before using it in a SQL query. This can help prevent malicious input from being executed as SQL code.

4. Limit database privileges: Use the principle of least privilege and only grant the necessary permissions to database users. This can help limit the impact of a successful SQL injection attack.

5. Use a web application firewall: A WAF can help detect and block SQL injection attacks before they reach your application.

By following these best practices, you can significantly reduce the risk of SQL injection in your PHP applications.

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John Davidson

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