How Can I Secure MySQL Queries in PHP Using Prepared Statements?

Secure MySQL Prepared Statements in PHP

Prepared statements enhance the security of database queries by preventing SQL injection attacks. They substitute user-supplied values as bind parameters, ensuring that no malicious code is directly executed.

To create a secure prepared statement, follow these steps:

1. Establish a Database Connection: Use mysqli_connect() to connect to the database.
2. Prepare the Query: Create a prepared statement by using mysqli_prepare(). Provide the query with placeholders for user-supplied values.
3. Bind Parameters: Call mysqli_stmt_bind_param() to specify the data types of the bind parameters and bind the actual values to the placeholders.
4. Execute the Query: Execute the prepared statement using mysqli_stmt_execute().
5. Get the Results: Process the fetched results as needed.

Here's an example:

$stmt = $mysqli->prepare("SELECT * FROM mytable WHERE userid=? AND category=? ORDER BY id DESC");
$stmt->bind_param('ii', intval($_GET['userid']), intval($_GET['category']));
$stmt->execute();

$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
    // Process the result row
}

$stmt->close();

BONUS: Speed Optimization

While prepared statements typically improve speed, the number of times they're used on a page does not significantly affect the overall speed optimization. Preparedness is primarily for security, not performance.

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