foreach last element array

Hi,

I'm trying to get the IF\ELSE statement within the foreach to print "keyword," or if it's the last element in the array just to print "keyword"

$key = "mykey";
$url = "http://access.alchemyapi.com/calls/text/TextGetKeywords";
$text = <<<EOD
Barrier Logic 
The barrier logic is a reliable cost effective solution to barrier electronics.
This barrier logic is designed to drive a torque motor.
FEATURES
The smallest industry standard module, with all the requirements for a Parking or Access barrier.
strong and Low Cost: Simple but effective for manual barriers.
Input Functions: The inputs are simple normal open inputs with toggle, raise, lower and collision functions.
Input Protection: The inputs are electrically isolated with opto-couplers to provide 500VDC isolation.
Applications:
Parking Barrier Control
Access Barrier Control
EOD;
$curlPost = 'apikey='  . urlencode($key) . '&text=' . urlencode($text) . '';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $curlPost);
$data = curl_exec($ch);
curl_close($ch);
//echo $data;

$xml = new SimpleXMLElement($data);
$results = $xml->keywords;
$children = $results->children();
$total = count($children);
//echo $total;
$i=0;
foreach($children AS $child) {
	if ($i < $total) {
		print $i . $child.", \n";
		}
	elseif ($i == $total) {
		print $child;
	}
	$i++;
}