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my friends website got hacked, the hacker leak all of the database data using SQLMAP from http://example.com/users/users.php?id=3 what methods exist in php to avoid writing vulnerable code like this?

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Welcome to Security.SE. The issue isn't sqlmap, but SQL injection.

What is SQL Injection?

SQL injection is a vulnerability that allows an attacker to control the data in and out of the database. This is how your friend's site was broken in to.

How do I protect against SQL injection?

The universal fix is to use parameterized queries. How this is done depends on the language that is used. For PHP, the PDO library supports this.

Additional reading material

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