How to Securely Insert Form Values into a MySQL Database in PHP?

Inserting Values from the Form into MySQL

In PHP, inserting values from a form into a MySQL database is a common task. However, if the code is not executed correctly, the expected result may not occur.

Consider this code:

$sql = "INSERT INTO users (username, password, email)
VALUES ('".$_POST["username"]."','".$_POST["password"]."','".$_POST["email"]."')";

This code creates a string variable that contains a MySQL query, but it does not execute the query. To execute the query, you need to use the following steps:

1. Prepare Statement:

   $stmt = $mysqli->prepare($sql);

2. Bind Parameters:

   $stmt->bind_param("sss", $_POST['username'], $_POST['email'], $_POST['password']);

3. Execute Statement:

   $stmt->execute();

By preparing the statement and binding the parameters, you prevent SQL injection attacks and ensure that the user input is safely handled.

It's also crucial to consider the security aspect of storing passwords. Instead of storing plain text passwords, it's recommended to use the password_hash function to store a hash of the password, enhancing the security of your application.

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