How should the context switch to SQL be handled in PHP code?

When switching context to SQL in PHP code, it is important to properly handle connections, queries, and error handling. To do this, create a connection to the database using PDO or mysqli, execute SQL queries safely using prepared statements to prevent SQL injection, and handle any potential errors that may occur during the process. 

// Create a PDO connection to the database
$dsn = 'mysql:host=localhost;dbname=mydatabase';
$username = 'username';
$password = 'password';
try {
    $pdo = new PDO($dsn, $username, $password);
} catch (PDOException $e) {
    die('Connection failed: ' . $e->getMessage());
}

// Prepare and execute a SQL query using a prepared statement
$stmt = $pdo->prepare('SELECT * FROM users WHERE id = :id');
$stmt->bindParam(':id', $id, PDO::PARAM_INT);
$stmt->execute();
$results = $stmt->fetchAll();

// Handle any errors that may occur during the query execution
if (!$results) {
    die('Error executing query');
}

// Process the results as needed
foreach ($results as $row) {
    echo $row['username'] . '<br>';
}

Keywords

SQL context switch PHP code handling database integration

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