$pages = [
    "index" => [
        "title" => "Intro to this multipage.",
        "file" => __DIR__ . "/$base/index.php",
    ],
    "print-get" => [
        "title" => "Print the content of \$_GET variable.",
        "file" => __DIR__ . "/$base/print-get.php",
    ],
    "get-samples" => [
        "title" => "Try various links using GET queryparams.",
        "file" => __DIR__ . "/$base/get-samples.php",
    ],
    "print-server" => [
        "title" => "Print the content of \$_SERVER variable.",
        "file" => __DIR__ . "/$base/print-server.php",
    ],
    "info-_server" => [
        "title" => "Details about the \$_SERVER variable.",
        "file" => __DIR__ . "/$base/info-_server.php",
    ],
    "foreach-server" => [
        "title" => "Details about the lengths of the values in \$_SERVER",
        "file" => __DIR__ . "/$base/foreach-server.php",
    ],
    "error" => [
        "title" => "error",
        "file" => __DIR__ . "/$base/error.php",
    ],
];