How can PHP developers protect against SQL injection and what functions are commonly used for this purpose?

To protect against SQL injection in PHP, developers should use prepared statements with parameterized queries. This method separates the SQL query logic from the user input, preventing malicious SQL code from being executed. Commonly used functions for this purpose include mysqli_prepare() and bind_param(). 

// Establish a database connection
$mysqli = new mysqli("localhost", "username", "password", "database");

// Prepare a SQL statement using a parameterized query
$stmt = $mysqli->prepare("SELECT * FROM users WHERE username = ?");
$stmt->bind_param("s", $username);

// Set the parameter values and execute the query
$username = $_POST['username'];
$stmt->execute();

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

// Close the statement and connection
$stmt->close();
$mysqli->close();

Keywords

SQL injection PHP developers protection functions commonly used

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