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Prevent mysql injection in Php before submitted to the database?

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Prevent mysql injection in Php before submitted to the database?
posted Aug 8, 2014 by Vrije Mani Upadhyay

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Best answer

Use either PDO or Mysqli with the binding syntax. This alone will prevent most injection attacks.

Example:

 $stmt = $db->prepare(
                'UPDATE users ' .
                'SET userEmail=:email, userSalt=:salt, userPass=:pass ' .
                'WHERE userId=:userId LIMIT 1' );
    $stmt->bindParam( ':email',  $this->_email,    \PDO::PARAM_STR );
    $stmt->bindParam( ':salt',   $this->_salt,     \PDO::PARAM_STR );
    $stmt->bindParam( ':pass',   $this->_password, \PDO::PARAM_STR );
    $stmt->bindParam( ':userId', $this->_id,       \PDO::PARAM_INT );
    $stmt->execute();

In the above example, trying to escape the :email binding to insert a DROP TABLE won't work.

You still need to be careful with user-provided data. For instance, if the user provides a $docId for a get document query, make sure they're authorized for the document being requested. (And not just guessing a $docId belonging to some other user).

answer Aug 9, 2014 by Rahul Singh
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