What security considerations should PHP developers keep in mind when constructing SQL queries to prevent SQL injection attacks?

To prevent SQL injection attacks, PHP developers should use prepared statements with bound parameters instead of directly inserting user input into SQL queries. This helps to separate the SQL logic from the user input, making it impossible for malicious input to alter the query structure. 

// Example of using prepared statements to prevent SQL injection
$pdo = new PDO("mysql:host=localhost;dbname=myDB", "username", "password");

$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username AND password = :password");
$stmt->bindParam(':username', $username);
$stmt->bindParam(':password', $password);
$stmt->execute();

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

Keywords

SQL injection PHP developers security considerations constructing queries prevent attacks

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