What are some key considerations when writing PHP scripts to interact with a database?

Key considerations when writing PHP scripts to interact with a database include using prepared statements to prevent SQL injection attacks, properly handling errors to ensure data integrity, and closing database connections after use to free up resources. 

// Example PHP code snippet using prepared statements to interact with a database

// Establish a connection to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Prepare a SQL statement with a placeholder for user input
$stmt = $conn->prepare("INSERT INTO users (username, email) VALUES (?, ?)");

// Bind parameters to the placeholders
$stmt->bind_param("ss", $username, $email);

// Set the parameters and execute the statement
$username = "john_doe";
$email = "john.doe@example.com";
$stmt->execute();

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

Keywords

SQL injection PDO prepared statements database connection error handling

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