Shorten URLs using the Google URL Shortener and PHP

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<?php
// Coded by Mike Rogers (http://www.fullondesign.co.uk/) 1st October 2010.

function shorten($url, $qr=NULL){
	if(function_exists('curl_init')){
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
		curl_setopt($ch, CURLOPT_URL, 'http://goo.gl/api/shorten');
		curl_setopt($ch, CURLOPT_POST, TRUE);
		curl_setopt($ch, CURLOPT_POSTFIELDS, 'security_token=null&url='.urlencode($url));

		$results = curl_exec($ch);
		$headerInfo = curl_getinfo($ch);
		curl_close($ch);

		if ($headerInfo['http_code'] === 201){ // HTTP Code 201 = Created
			$results = json_decode($results);
			if(isset($results->short_url)){
				$qr = !is_null($qr)?'.qr':'';
				return $results->short_url.$qr;
			}
			return FALSE;
		}
		return FALSE;	

	}
	trigger_error("cURL required to shorten URLs.", E_USER_WARNING); // Show the user a neat error.
	return FALSE;
}

// Example: Just the Short URL
echo shorten('http://www.google.com/');

// Example: Give the Short Code URL and image it.
$qrURL = shorten('http://www.google.com/', TRUE);
echo '<img src="'.$qrURL.'" />';
?>

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