In what situations should PHP developers consider using prepared statements or parameterized queries to enhance security and prevent SQL injection vulnerabilities?

To enhance security and prevent SQL injection vulnerabilities, PHP developers should use prepared statements or parameterized queries when executing SQL queries that involve user input. This helps separate SQL code from user input, preventing malicious input from being executed as SQL commands. 

// Using prepared statements to prevent SQL injection
$stmt = $pdo->prepare("SELECT * FROM users WHERE username = :username");
$stmt->bindParam(':username', $username);
$stmt->execute();

Keywords

PHP prepared statements parameterized queries security SQL injection

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