Are there any security considerations to keep in mind when writing SQL commands in PHP?

When writing SQL commands in PHP, it is important to sanitize user input to prevent SQL injection attacks. This can be done by using prepared statements with parameterized queries, which separate the SQL code from the user input. By binding parameters to placeholders in the SQL query, you can ensure that user input is treated as data rather than executable code. 

// Establish a database connection
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Prepare a SQL statement with a parameterized query
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');

// Bind the user input to the parameter
$stmt->bindParam(':username', $_POST['username']);

// Execute the query
$stmt->execute();

// Fetch the results
$results = $stmt->fetchAll();

Keywords

SQL injection prepared statements PDO mysqli_real_escape_string parameterized queries

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