$replyKeyboardMarkup = ['_' => 'replyKeyboardMarkup', 
		      'resize' => false, 
		      'single_use' => false, 
		      'selective' => false, 
		      'rows' => [	'_' => 'keyboardButtonRow', 'buttons' => [['_' => 'keyboardButton', 'text' => 'testme']]	],
		      'placeholder' => 'Choose an option'];

$replyInlineMarkup = ['_' => 'replyInlineMarkup', 
				'rows' => [
						[	'_' => 'keyboardButtonRow', 
							'buttons' => [
										['_' => 'keyboardButton', 'text' => 'string']
									]
						]
						]
				]; 
$MadelineProto->messages->sendMessage(['peer' => "@$username", 'reply_markup'=>$replyKeyboardMarkup,  'message' => "dummy text", 'parse_mode' => 'HTML' ], ['async' => true]);

$MadelineProto->messages->sendMessage(['peer' => "@$username", 'reply_markup'=>$replyInlineMarkup,  'message' => "dummy text", 'parse_mode' => 'HTML' ], ['async' => true]);