server.php

<?php

header('Access-Control-Allow-Origin: ' . $_SERVER['HTTP_ORIGIN']);
header('Access-Control-Allow-Methods: GET, PUT, POST, DELETE, OPTIONS');
header('Access-Control-Max-Age: 1000');
header('Access-Control-Allow-Headers: Content-Type, Authorization, X-Requested-With');

$number=$_REQUEST['phone'];
$sessionId=$_REQUEST['sessionId'];
$text=$_REQUEST['text'];
$code=$_REQUEST['code'];




$mode="menu";


$level = 1;
$ussd_array = explode ("*",$text);
if(count($ussd_array)==0){
	$level=0;
}else{
	$level=count($ussd_array);
}

$level=$level+1;

if(trim($text)=="")
	$level=1;



switch ($ussd_array[0]) {
	case '0':
		$mode="menu";
		break;
	case '':
		$mode="menu";
		break;
	case '1':
		$mode="create";
		break;
	case '2':
		$mode="balance";
		break;
	case '3':
		$mode="sendMoney";
		break;
	
	default:
		# code...
		break;
}

if($level==1){
	displayMenu();
}else{
	if($mode=="menu"){
		switch ($text) {
			case '0':
				displayMenu();
				break;
			case '1':
				createAccount();
				break;
			case '2':
				checkBalance();
				break;
			case '3':
				checkNumber();
				break;
			case '4':
				sendMoney();
				break;
			
			default:
				displayError();
				break;
		}
	}else if($mode=="create"){
		switch ($text) {
			case '1':
				createAccount();
				break;
			case '1*1':
				echo "END You choose \n Male";
				break;
			case '1*2':
				echo "END You choose \n Female";
				break;
			case '1*3':
				echo "END You choose \n Not Now";
				break;
			
			default:
				displayError();
				break;
		}

	}else if($mode=="balance"){
		checkBalance();

	}else if($mode=="sendMoney"){
		switch ($text) {
			case '3':
				sendMoney();
				break;
			case '3*1':
				echo "END You choose \n MTN";
				break;
			case '3*2':
				echo "END You choose \n AIRTEL";
				break;
			case '3*3':
				echo "END You choose \n TIGO";
				break;
			
			default:
				displayError();
				break;
		}

	}
}





function displayMenu(){
	$text="CON USSD Testing \n";
	$text.="1. Create Account \n";
	$text.="2. Check Balance \n";
	$text.="3. Check My Number \n";
	$text.="4. Send Money \n";
	$text.="5. Buy Books \n";
	$text.="44. Next \n";
	echo $text;
}
function createAccount(){
	$text="CON Creating Account\n";
	$text.="1. Male \n";
	$text.="2. Woman \n";
	$text.="3. Not Now \n";
	echo $text;
}
function checkBalance(){
	$text="END Account Balance\n";
	$text.="Your account Balance is 43,050Rwf \n";
	echo $text;
}
function displayError(){
	$text="END Error\n";
	$text.="Uknown USSD command \n";
	echo $text;
}
function checkNumber(){
	
	$text="END Ckeck Number\n";
	$number=$_REQUEST['phone'];
	$text.="Your number is ".$number." \n";
	echo $text;
}
function sendMoney(){
	$text="CON Send Money\n";
	$text.="1. MTN \n";
	$text.="2. TIGO \n";
	$text.="3. AIRTEL \n";
	echo $text;
}