How can PHP scripts handle user input while running?

PHP scripts can handle user input while running by using superglobal arrays like $_GET, $_POST, or $_REQUEST to access user input data. This data can then be sanitized and validated to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. By using functions like htmlspecialchars() or mysqli_real_escape_string(), PHP scripts can securely process user input. 

$user_input = $_POST['user_input'];

// Sanitize user input to prevent security vulnerabilities
$sanitized_input = htmlspecialchars($user_input);

// Validate user input
if (strlen($sanitized_input) > 0) {
    // Process user input
    echo "User input: " . $sanitized_input;
} else {
    echo "Invalid input";
}

Keywords

input validation htmlspecialchars filter_input $_GET $_POST

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