PHP - php文件内调用html文件

";
    // 002
    $file = fopen('index.html','r');
    if ($file) {
        while(!feof($file)) {
            $line = fgetc($file);
            echo $line;
        }
    };

    fclose($file);

    echo "
";
    // 003
    $str = file_get_contents('index.html');
    echo $str;

    echo "
";
    // 004
    include ("index.html");

    echo "
";
?>