How can PHP developers ensure that user-submitted data in forms is protected from malicious code injections?

To protect user-submitted data in forms from malicious code injections, PHP developers can use functions like `htmlspecialchars()` or `mysqli_real_escape_string()` to sanitize the input. These functions help prevent malicious scripts from being executed when the data is displayed or stored in a database. 

// Example of sanitizing user input using htmlspecialchars()
$user_input = $_POST['user_input'];
$sanitized_input = htmlspecialchars($user_input);

// Example of sanitizing user input using mysqli_real_escape_string()
$user_input = $_POST['user_input'];
$mysqli = new mysqli("localhost", "username", "password", "database");
$sanitized_input = $mysqli->real_escape_string($user_input);

Keywords

SQL injection Cross-site scripting htmlentities prepared statements filter_input

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