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Rapid Development Framework for PHP 5.5.0+

Install Drone options:

  • Git clone: git clone
  • Subversion checkout URL:
    • Subversion checkout library files only:
  • Download ZIP file

Documentation Topics

Quick Start

To install Drone simply download the package and install in your project directory. For Apache use the ./.htaccess file, for Nginx refer to the ./nginx.conf example configuration file.

Directory Structure

By default Drone uses the following directory structure:

  • _app (framework + application source files)
    • com (common application files)
    • lib (framework + application class files)
    • mod (controller files)
    • tpl (view template files)
      • _global (global view template files)
  • skin (front asset files)

The directories for controllers (_app/mod), templates (_app/tpl) and global templates (_app/tpl/_global) can be changed using Drone settings.

Class Autoloading

Class autoloading is completed using the autoload() function in the index.php file, example:

// set class autoloading paths
	PATH_ROOT . '_app/lib',
	PATH_ROOT . '_app/mdl'

In this example classes will be autoloaded from the _app/lib and the _app/mdl directories. The autoloader expects the use of namespaces, example:

$myobj = new \Mylib\Myclass;

Would load the class _app/lib/Mylib/Myclass.php or _app/mdl/Mylib/Myclass.php (depending on where the class is located).

Drone Function

The drone() function can be used to easily access the Drone core class, example:

drone()->header('Content-type', 'image/jpeg');

Helper Functions

Drone helper functions can be used to access Drone components easily, example of the request() helper function:

$name = request()->post('name'); // get POST request value for 'name'

Drone helper functions available:

  • data() - drone()->data alias
  • error() - trigger error (drone()->error() alias)
  • error_last() - get last error (drone()->errorLast() alias)
  • flash() - set flash message (drone()->flash alias)
  • logger() - drone()->log alias
  • pa() - string/array printer
  • param() - get route param (similar to view()->param())
  • redirect() - redirect to location (drone()->redirect() alias)
  • request() - drone()->request alias
  • session() - drone()->session alias
  • template() - get template formatted name (drone()->view->template() alias)
  • template_global() - get global template formatted name (drone()->view->templateGlobal() alias)
  • view() - drone->view alias


Drone can run without changing the default settings, however, the default settings should be changed in the _app/com/xap.bootstrap.php file when Drone is used in a production environment:

// turn debug mode off - this will prevent unwanted output in a production environment
\Drone\Registry::set(\Drone\Core::KEY_DEBUG, false);

// turn off backtrace in log - this should only be used in a development environment
\Drone\Registry::set(\Drone\Core::KEY_ERROR_BACKTRACE, false);

// turn on logging of errors in the default Web server log file
\Drone\Registry::set(\Drone\Core::KEY_ERROR_LOG, true);

Run Application

The last call in the index.php file should run the application:


Nothing should happen after this call as the output buffer has already ended.

To setup an application response simply create a new controller file in the _app/mod directory, for example _app/mod/hello-world.php:

// display view template with auto template name

Next, create a view template _app/tpl/hello-world.tpl:

Hello world

Finally, visit your Web application with request /hello-world.htm in a browser and you should see the Hello world text.


There are two types of routes in Drone: static and mapped.

The Drone routing workflow is:

  1. Check match for mapped route
  2. Check for static route
  3. Trigger 404 handler

Static Routes

Static routes require no mapping and instead rely on static file paths. For example, the application request /hello-world.htm will search for the controller file _app/mod/hello-world.php.

A missing static route file will trigger the 404 error handler
Static route lookups happen after mapped route lookups

Mapped Routes

Mapped routes require mapping in the _app/com/xap.bootstrap.php file, example:

	'/item-view' => 'item/view',
	'/item-delete/:id' => 'item/delete'

In the example above Drone will map the request /item-view.htm to the controller file _app/mod/item/view.php. The next array element will map the request /item-delete/14.htm to the controller file _app/mod/item/delete.php, and Drone will map the route param id to value 14.

Here is another example that uses Drone's Controller class logic:

	'/user/:id' => 'user->view',
	'/user/:id/delete' => 'user->delete'

In this example the request /user/5.htm will be mapped to the controller file _app/mod/user.php with the route param id set to 5. In this case the controller file _app/mod/user.php will need to contain the Controller class with the public method view (the action), for example:

class Controller extends \Drone\Controller
	public function view()
		$this->id = param('id'); // get route param value (5)

Likewise the request /user/5/delete.htm will be mapped to the controller file _app/mod/user.php with the route param id set to 5 and call the Controller public class method delete.

Custom controller class names can be used, for example:

	'/user/:id' => 'user->\UserController->view',
	'/user/:id/delete' => 'user->\UserController->delete'

Now the request /user/5.htm will be mapped to the controller file _app/mod/user.php and will need to contain the UserController class with public method view.

A missing Controller class will trigger the 500 error handler
A missing Controller action (class public method) will trigger the 500 error handler
Mapped route lookups happen before static route lookups
Optional Route Parameters

Optional route params can be used, for example:

	'/product/:category_id/:id?' => 'product->view',

Now the request /product/14.htm will route to the controller file with the param category_id with value 14. Likewise, the request /product/14/5.htm will route to the controller file with the params category_id with value 14, and the id param with value 5, for example:

$cat_id = param('category_id');
if(param('id') !== null) // test if exists
	$id = param('id');
Wildcard Route Parameters

Wildcard route params can be used, for example:

	'/user/*' => 'user->view',

Now the request /user/a/b/c.htm will be mapped to the controller file with action and all params will become available, for example:

$params = param(0, 1, 2); // ['a', 'b', 'c']
// or set a single value
$param = param(1); // 'b'

Wildcard route param labels can also be used, for example

	'/product/*(:category/:subcat/:id)' => 'product->view',

Now the params can be accessed using the param labels, for example the request /product/category1/category2/4.htm would be used like:

$category = param('category'); // 'category1', alias: param(0)
$subcategory = param('subcat'); // 'category2', alias: param(1)
$id = param('id'); // '4', alias: param(2)

Duplicate Content Protection
A request mapped to a route with optional or wildcard params must end in '/' when not using params in the request, for example route /route.htm would result in a 404 error, but /route/ will work.

Likewise, a request mapped to a route with optional or wildcard route params must not end in '/' when using params, for example route /route/x/y/z/ would result in a 404 error, but /route/x/y/z.htm will work.

Route Files

A route file can be used for any base route (using the pattern /[base route]:), for example:

	// setup route file for base route
	'/product:' => PATH_ROOT . '_app/com/route/product.php'

The PATH_ROOT . '_app/com/route/product.php' file should return an array of mapped routes, for example:

return [
	'/product/:id/delete' => 'product->delete',
	'/product/:id' => 'product->view'

A route file matched route will override any mapped route following the route file entry


Controllers are files that may or may not contain a Controller class depending on if the requested route is mapped, and mapped with an action (see Mapped Routes).

An example of a simple controller file is the default _app/mod/index.php controller:

// log example
logger()->debug('Index controller start');

// set params
view()->drone_ver = \Drone\Core::VERSION;
view()->drone_params = drone()->getAll();

// display view (displays _app/tpl/index.tpl when no template name)

// log example
logger()->debug('Index controller end');

In the controller file several helper functions are called: logger() and view(). These helper functions access Drone core components (in this case drone()->log and drone()->view). So instead of calling drone()->log->debug('x') a helper function can be used (see more Helper Functions).

View variables can be set using the view() helper function, which accesses the \Drone\View object, for example:

view()->my_var = 'my value';

Now the variable $my_var is accessible from the view template file.

Controller files should never output anything (and outputs will be flushed when debug mode is off), instead output from view template files

Controller Class

When a route is mapped with an action (for example: '/my/route' => 'route->action') the controller file must contain a Controller class (or a custom controller class if used, for example UserController, see Mapped Routes), otherwise a 500 error will be triggered.

Here is an example of a simple Controller class in a controller file:

class Controller extends \Drone\Controller
	public function action()
		logger()->debug('Controller action called');

		// action logic here

In the mapped route example above the class method action() will be called for the request /my/route.htm.

Any public properties in the Controller class will be available as variables in view template files, for example in the Controller class example above we could add:

	public function action()
		$this->my_class_var = 'my value';

		// action logic here

Now the variable $my_class_var is accessible from the view template file, unless the same variable name has been set using the view()->[var name] logic, which will override class variables.

The Controller class can use two special methods:

  • __before() - called before the controller action method is called
  • __after() - called after the controller action method is called
Mapped route params are accessible from the param() helper function (example: param('id'))

It is recommended that Controller classes extend the \Drone\Controller class, this is because the \Drone\Controller will automatically deny static requests to the controller file (or mapped requests with no action).


The Drone \Drone\View object handles all view logic like view variables and template path formatting.

The view object is accessible via the view() helper function.

View variables (or properties) are set in controller files, for example:

view()->my_var = 'my value';
view()->another_var = 'another value';
view()->display(); // display template file

The view()->display() method is used to display a template file. If view()->display() is not called then no view will be displayed (no output buffer).

When the view display method is called from the controller it will automatically display a similarly named template file, for example, the controller file _app/mod/test-controller.php will display the _app/tpl/test-controller.tpl when view()->display() is called.

To assign a custom view template file use a template name, for example:

// display template file '_app/tpl/my-dir/my-template.tpl'

Also, a controller template path can be set using the view()->displayPath() method:

// set controller template path '_app/tpl/my-dir/'
// display template file '_app/tpl/my-dir/my-template.tpl'

Other useful view methods:

  • view()->clearProperties() - clears all view variables/properties
  • view()->getProperties() - get array of all view variables/properties

View Templates

Now the variables set in the view example above are accessed in the view template file like:

Value for 'my_var' is: <?=$my_var?> <br />
Value for 'another_var' is: <?=$another_var?>

Which would output:

Value for 'my_var' is: my value
Value for 'another_var' is: another value

Template global files can be included using the template_global() helper function, for example:

<?php include template_global('header'); ?>
Some body text
<?php include template_global('footer'); ?>

This example includes the global template files _app/tpl/_global/header.tpl and _app/tpl/_global/footer.tpl

The helper function template() can be used to include non-global template files

Global View Header and Footer Templates

Global view header and footer templates can be used, for example in the _app/com/xap.bootstrap.php file a before hook can be created to set the templates:

drone()->hook(\Drone\Core::HOOK_BEFORE, function(){

Basically this tells the view to automatically include the global template files for header (_app/tpl/_global/header.tpl) and footer (_app/tpl/_global/footer.tpl). Now the include template_global('header') and include template_global('footer') lines are not required in the view template file (like in the View Templates example above).

If a view template file does not require the global header and footer template files, simply turn off the global includes in the controller file like:



The \Drone\Logger object is used for logging and accessed using the logger() helper function.

Log a simple application message example:

logger()->debug('My log message'); // log message with debug level

A category can also be used when logging a message, for example:

// log message with category 'account'
logger()->debug('User login successful', 'account');

The default category app is used when no category has be set

Data (as an array) can also be passed to the log handler using the data() method:

logger()->data([1, 2, 3]);
logger()->debug('My message with data');

Now the message will include the data as a flattened string.

Log Levels

Drone uses the following logging methods for the logging levels: debug, warn, error and fatal:

  • logger()->debug() - debugging messages
  • logger()->warn() - warning messages
  • logger()->error() - error messages (non-fatal)
  • logger()->fatal() - fatal error messages

The logger()->trace method is used by the framework for debugging purposes

Log Configuration

Logging configuration is done in the _app/com/xap.bootstrap.php file.

To set the global log level use:


This means only messages with the debug level or higher will be logged.

To set a log file where log messages will be outputted to use something like:


This will output log messages to the log file _app/var/drone.log.

Using a log file is not recommended for production environments

Custom Log Handler

Setting a custom log handler is simple, for example:

drone()->log->setLogHandler(function($message, $level, $category, $data) {
	xap('drone_log:add', ['message' => $message, 'level' => $level,
		'category' => $category, 'data' => serialize($data)]);
	return true;

In the above example a custom log handler has been set and allows the log messages to be saved in the database table drone_log using the xap() database function.

If a custom log handler is set and returns boolean value false Drone will continue on with the default logging logic (caching log messages and writing to a log file if configured), however, if true is returned by the log handler Drone will stop the default logging processes.

Other useful logger methods:

  • logger()->get() - gets log as array
  • logger()->getString() - gets log as string
  • logger()->setDateFormat() - set log message date format

Error Handling

Errors can be triggered using the error() helper function, here is an example:

	// trigger 500 error handler
	error('Something bad happened');

Errors can also be triggered using error codes, for example a 404 Not Found:

error(404); // trigger 404 error handler

Or, use custom error codes (cannot be 403, 404 or 500 as these are used by Drone):

error(100, 'My custom error'); // trigger 100 error handler
A custom error code will attempt to trigger a custom error handler, if the handler is not found the 500 error handler will be triggered
Errors are automatically sent to the \Drone\Logger object to be logged

Setting Error Handlers

By default at least three errors handlers should be set in the _app/com/xap.bootstrap.php file: a default error handler, a 404 error handler and a 500 error handler, example:

drone()->error(function($error) { echo '<div style="color:#f00;">' . $error
	. '</div>'; });
drone()->error(404, function() { drone()->run('error->\ErrorController->_404'); });
drone()->error(500, function() { drone()->run('error->\ErrorController->_500'); });

The default error handler will be called when errors are triggered inside the application (like E_USER_ERROR, E_USER_WARNING, etc.). This happens because of the default Drone error handler.

The default Drone error handler does not need to be changed, but it can be changed using:

drone()->set(\Drone\Core::KEY_ERROR_HANDLER, ['\My\Class', 'errorHandlerMethod']);

Custom error handlers can also be set, for example:

drone()->error(100, function() { drone()->run('error->\ErrorController->_100'); }

Now if a 100 error is triggered the handler would call the controller action method _100() in the _app/mod/error.php controller file.

The error_last() helper function can be used to get the last error message.

Core Methods

There are Drone core (\Drone\Core) methods that are available for application use.


The \Drone\Registry class is useful for global variables and objects, here is an example:

use \Drone\Registry;
Registry::set('user', new \User($user_id)); // set key/value
if(Registry::has('user')) // check if key exists
	if(Registry::get('user')->isActive()) // get key value
		// or $user = &Registry::get('user'); // as reference
Registry::clear('user'); // unset key

Drone uses some params for internal use, these param keys all share the prefix __DRONE__., for example a Drone param is __DRONE__.error.backtrace

Route Parameters

Route parameters, or route params, are used to extract route param values. For example, for the mapped route '/route/:id' => 'route->action' the param id will be available as a route param, controller example:

$id = param('id'); // get route param 'id'

To verify a route param exists check for the boolean value false:

if(param('id') === null)
	// the param 'id' does not exist

Multiple params can also be fetched, for example:

$params = param('id', 'name'); // ['id' => 'x', 'name' => 'y']

All params can be fetched using:

$params = param(null); // ['id' => 'x', 'name' => 'y', ...]
// or count all params:
if(count(params(null)) > 2) // more than 2 params

Optional and wildcard route params are also available


Hooks can be used to initialize, import logic into or finalize an application. The three types of hooks are: before (triggered before the controller file is imported), middle (triggered after action is called and before template is loaded), and after (triggered after the controller file is imported, the action is called and template file is imported).

Example of before, middle and after hooks set in _app/com/xap.bootstrap.php

// call function to init application logic
drone()->hook(\Drone\Core::HOOK_BEFORE, function() { initAppLogic(); });
// import some app front logic
	function() { include PATH_ROOT . '_app/com/front.php'; });
// print Drone log
drone()->hook(\Drone\Core::HOOK_AFTER, function() { pa('', 'Log:', drone()->log->get()); });

For controller level hooks (special methods __before() and __after) see Controller Class

Hooks can also be set to require a hook file instead of using a callable. Simply use a string instead of callable, for example:

// hook to require file for front logic
drone()->hook(\Drone\Core::HOOK_MIDDLE, PATH_ROOT . '_app/com/hook/middle.php');

Note: before and middle hook files will be in the scope of view variables (meaning a variable $var set in a hook file will be accessible in the view template as $var), but after hook files are outside that scope.


Redirection to another location can be done in controller files use the redirect() (\Drone\Core->redirect() alias) function, for example:

redirect('/new/route.htm'); // redirect

If the redirection is a permanent (301) redirect use:

redirect('/forever/route.htm', true); // redirect with 301


HTTP headers can be sent in controller files using the drone()->header() header method, for example:

drone()->header('Cache-Control', 'no-cache, must-revalidate');

For redirection to another location use the helper function redirect() instead of the header method


The drone()->timer() method can be used for timers, for example in a controller file:

$elapsed_time = drone()->timer(); // 0.00060
// do some heavy lifting
$elapsed_time = drone()->timer(); // 0.00071

Also custom timers can be used, for example:

drone()->timer('my_job'); // start timer at 0
// do some heavy lifting
$elapsed_time = drone()->timer('my_job'); // 0.00014

Stop Application

If the application needs to be stopped in a controller file it can be done manually:

drone()->stop(); // the application will stop
The drone()->stop() method does not need to be called unless a forced stop is desired (Drone will automatically call drone()->stop() after executing the request, triggering an error or redirecting)
After hooks are triggered during a forced application stop, but the Controller method __after() will not be called

Request Variables

Request variables can be accessed using the request() helper function (which uses the \Drone\Request object), for example:

$name = request()->get('name'); // get value from GET variable 'name'

Methods used to get request variables:

  • request()->cookie() - $_COOKIE alias
  • request()->get() - $_GET alias
  • request()->evn() - $_ENV alias
  • request()->file() - $_FILES alias
  • request()->get() - $_GET alias
  • request()->post() - $_POST alias
  • request()->request() - $_REQUEST alias
  • request()->server() - $_SERVER alias

Get methods can also fetch multiple variables using an array, example:

// ['var1' => x, 'var2' => y, 'var3' => z]
$vars = request()->get(['var1', 'var2', 'var3']);

Methods used to check if request variables exist:

  • request()->hasCookie()
  • request()->hasFile()
  • request()->hasGet()
  • request()->hasPost()
  • request()->hasRequest()

Has methods can be used to check if multiple variables exists using an array, example:

if(request()->hasPost(['var1', 'var2', 'var3'])) // true or false

Methods used to remove request variables:

  • request()->removeCookie()
  • request()->removeGet()
  • request()->removePost()
  • request()->removeRequest()

Request variable values can be globally sanitized using the request()->filter() method, for example:

// auto trim all GET + POST variable values
request()->filter(\Drone\Request::TYPE_GET | \Drone\Request::TYPE_POST,
	function($v) { return data()->filterSanitize(trim($v)); });

Cookies are easy to set using:

// set cookie 'my_cookie' that will expire in 10 days
request()->setCookie('my_cookie', 'cookie value', '+10 days');

Other useful request methods:

  • request()->getHost()
  • request()->getIpAddress()
  • request()->getMethod() - get the request method
  • request()->getPort()
  • request()->getProtocol()
  • request()->getQueryString()
  • request()->getReferrer()
  • request()->getSchema()
  • request()->getUri()
  • request()->isAjax() - check if Ajax request
  • request()->isPost() - check if POST request method
  • request()->isSecure() - check if HTTPS request

Session Handling

Sessions are handled with the \Drone\Session object and accessed using the session() helper function, example:

session()->set('my_key', 'my value');
	$key = session()->get('my_key');

The session handler will automatically start a session (if not already started) when the session() helper function is used in the application

Using array values in sessions are simple:

session()->add('user', 'id', $user_id);
if(session()->has('user', 'id'))
	$user_id = session()->get('user', 'id');

Other useful session methods:

  • session()->clear() - clear a session variable
  • session()->count() - used to get count of session array variable
  • session()->destroy() - destroy a session
  • session()->flush() - flush all session variables
  • session()->getId() - get session ID
  • session()->isArray() - check if session variable is array
  • session()->isSession() - check if session has been started
  • session()->newId() - regenerate session ID

Flash Messages

Flash messages are simple session messages that last only until they are used. The \Drone\Flash object handles flash messages and can be accessed using the flash() helper function, example:

// in a controller a validation error is set as a flash message
flash('error', 'Please enter a valid email address');

Next, in the view template file call the flash message:


The flash message will only appear once, and be destroyed immediately after. This is very helpful for displaying one-time client messages and errors.

When the flash() helper function is called a session with be started automatically if required

The true power of flash messages is the use of templates, for example in the _app/com/xap.bootstrap.php file set a flash message template:

// sets template for flash message group 'error'
\Drone\Flash::template('error', '<div class="error">{$message}</div>');

Then set the flash message in the controller:

flash('error', 'Please enter a valid email address');

Now in the view template when the flash() helper function is called with the group error the template is applied:


This will output the HTML:

<div class="error">Please enter a valid email address</div>

Also multiple group messages can be used:

// setup template to handle multiple messages
// the 2nd param is the group template, the 3rd param is the message template
\Drone\Flash::template('error', '<div class="error">{$message}</div>',
	'{$message}<br />');
// set multiple validation errors in group 'error'
flash('error', 'Please enter your name');
flash('error', 'Please enter a valid email address');

Now output the errors:


The output HTML:

<div class="error">Please enter your name<br />Please enter a valid email address
<br /></div>

Also the message template can be used without a group template, for example if every message should be in a separate <div> tag:

\Drone\Flash::template('error', null, '<div class="error">{$message}</div>');

Now using the same errors above the HTML output would be:

<div class="error">Please enter your name</div>
<div class="error">Please enter a valid email address</div>

Other useful flash methods:

  • flash()->clear() - clear a flash message
  • flash()->flush() - flush all flash messages
  • flash()->has() - check if flash message exists

Data Handling

Drone supports data handling: filtering, formatting and validation using the data() helper function (which uses the \Drone\Data object).


Data can be filtered/sanitized using the data()->filter* helper function syntax, for example:

// trim value
$trimmed = data()->filterTrim(' my value '); // 'my value'

Some filter methods use arguments (or params), for example:

// strip non-word characters, but allow whitespaces
$words = = data()->filterWord('my value!', true); // 'my value'

Available filters are:

  • filterAlnum(value, allow_whitespaces) - strip non-alphanumeric characters
  • filterAlpha(value, allow_whitespaces) - strip non-alpha characters
  • filterDate(value) - strip non-date characters
  • filterDateTime(value) - strip non-date/time characters
  • filterDecimal(value) - strip non-decimal characters
  • filterEmail(value) - strip non-email characters
  • filterHtmlEncode(value) - encode HTML special characters
  • filterNumeric(value) - strip non-numeric characters
  • filterSanitize(value) - strip tags
  • filterTime(value) - strip non-time characters
  • filterTrim(value) - trim spaces
  • filterUrlEncode(value) - encode URL
  • filterWord(value, allow_whitespaces) - strip non-word characters (same as character class '\w')


Data can be formatted using the data()->format* helper function syntax, for example:

// format number to currency
$currency = data()->formatCurrency(5); // '$5.00'

Some formatter methods use arguments (or params), for example:

// format number to currency with custom currency format
$currency = data()->formatCurrency(5, '$%0.2f USD'); // '$5.00 USD'

Available formats are:

  • formatBase64UrlDecode(value)
  • formatBase64UrlEncode(value)
  • formatByte(value, characters)
  • formatCurrency(value, format)
  • formatDate(value, format)
  • formatDateTime(value, format)
  • formatLower(value)
  • formatTime(value, format)
  • formatTimeElapsed(time_elapsed, characters)
  • formatUpper(value)
  • formatUpperWords(value)


Data validation can be done using the data()->validate* helper function syntax, for example:

// validate email value
	// warn user

Some validator methods use arguments (or params), for example:

// validate string length (minimum 4, maximum 50)
if(!data()->validateLength('my string', 4, 50))
	// warn

Available validators are:

  • validateAlnum(value, allow_whitespaces) - value is alphanumeric characters
  • validateAlpha(value, allow_whitespaces) - value is alpha characters
  • validateBetween(value, min, max) - value between min and max values
  • validateContains(value, contain_value, is_case_insensitive) - value contains value
  • validateContainsNot(value, contain_not_value, is_case_insensitive) - value does not contain value
  • validateDecimal(value) - value is decimal
  • validateEmail(value) - value is email
  • validateIpv4(value) - value is IPv4 address
  • validateIpv6(value) - value is IPv6 address
  • validateLength(value, min, max, exact) - value is min length, or under max length, or between min and max lengths
  • validateMatch(value, compare_value, is_case_insensitive) - value is match to value
  • validateNumeric(value) - value is numeric
  • validateRegex(value, pattern) - value is Perl-compatible regex pattern
  • validateRequired(value) - value exists (length > 0)
  • validateUrl(value) - value is URL
  • validateWord(value, allow_whitespaces) - value is word (same as character class '\w')

Arrays can be passed to data methods, for example:

$values = [' a ', ' b ', ' c '];
$trimmed = array_map([data(), 'filterTrim'], $values) ); // ['a', 'b', 'c']

Database Handling

Drone uses the Xap MySQL rapid development engine for database handling. Xap is an optional library and must be installed.

Get Xap options:

  • Git clone: git clone
  • Subversion checkout URL:
  • Download ZIP file

To install Xap put the bootstrap file in _app/com/xap.bootstrap.php, put the lib/Xap directory in the _app/lib directory, and include the _app/com/xap.bootstrap.php in the _app/com/xap.bootstrap.php file.

More Drone documentation can be found in the docs directory


Rapid Development Framework for PHP 5.5.0+







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