Are there any potential pitfalls to be aware of when querying SQL data in PHP?

One potential pitfall when querying SQL data in PHP is the risk of SQL injection attacks if user input is not properly sanitized. To prevent this, always use prepared statements with parameterized queries to securely pass user input to the database. 

// Example of using prepared statements to query SQL data in PHP
$pdo = new PDO("mysql:host=localhost;dbname=mydatabase", "username", "password");

// Prepare a statement
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");

// Bind parameters
$stmt->bindParam(':username', $username, PDO::PARAM_STR);

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

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

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

Keywords

SQL injection PDO prepared statements error handling data validation

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