What are some best practices for handling SQL queries in PHP to ensure successful retrieval of content?

When handling SQL queries in PHP, it is important to properly sanitize user input to prevent SQL injection attacks. One way to do this is by using prepared statements with parameterized queries. This helps to separate the SQL query logic from the data being passed into it, ensuring successful retrieval of content. 

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

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

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

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

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

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

Keywords

SQL injection prepared statements PDO mysqli error handling

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