$email = "invalidemail.com"; if (!filter_var($email, FILTER_VALIDATE_EMAIL)) { echo "Invalid email format"; }
$url = "example.com"; if (!filter_var($url, FILTER_VALIDATE_URL)) { echo "Invalid URL format"; }
$string = "Some text";
echo filter_var($string, FILTER_SANITIZE_STRING);
In this example, `filter_var()` is used to sanitize the string input, removing any tags or characters that may cause security issues.
These functions are part of the PHP core, and do not require any additional package or library for usage.