Awhile ago I wrote a light Twitter PHP class that could grab and update your status. I also threw in two methods for Tiny and Tr.im url shortners. Check it out.

// DEFINE TWITTER CLASS AND UPDATE STATUS WITH OUTPUT RETURNING HTTP CODE
$run = new twitterClass();
echo $run->UpdateStatus('my message');

// TWITTER CLASS
class twitterClass { 

	// SET GLOBAL VARIABLES 
    private $twitter_username = ''; 
    private $twitter_password = ''; 
	private $trim_username = '';
	private $trim_password = '';
    
	// CHECK WHERE THE REQUESTING URL IS COMING FROM
	public function CheckReferer(){
		$url = parse_url($_SERVER["HTTP_REFERER"]);
		return $url;
	}
	
	// GRAB THE RETURNED CODE FROM HTTP REQUEST AND REFERENCE DEFINITION
	public function HTTP_Code($code){
		switch ($code) {
			case 200:
				$return = "Updated!";
				break;
			case 301:
				$return = "Moved Permanetly!";
				break;
			case 302:
				$return = "Found!";
				break;
			case 304:
				$return = "Not Modified!";
				break;
			case 307:
				$return = "Temporary Redirect!";
				break;
			case 400:
				$return = "Bad Request!";
				break;
			case 401:
				$return = "Unauthorized!";
				break;
			case 403:
				$return = "Forbidden!";
				break;
			case 404:
				$return = "Not Found!";
				break;
			case 410:
				$return = "Gone!";
				break;
			case 500:
				$return = "Internal Server Error!";
				break;
			case 403:
				$return = "Not Implemented!";
				break;
			default:
				$return = "Bad Return Code! Code: $http_code_return. ";
			}
			
			return $return;
	}
	
	// REPLACE WITH Tiny URL
	public function TinyURL($url){
		$return = file_get_contents("http://tinyurl.com/api-create.php?url=".$url); 
		return $return; 
	}
	
	// REPLACE WITH Tr.im URL
	public function TrimURL($url){
		$xml = file_get_contents("http://api.tr.im/api/trim_url.xml?url=".$url."&newtrim=yes&username=".$this->trim_username."&password=".$this->trim_password); 
		$return =  new SimpleXMLElement($xml);
        return $return->url;
	}
	
	// GET LAST STATUS UPDATE
    public function LatestStatus() { 
        $buffer = file_get_contents("http://twitter.com/statuses/user_timeline/".$this->twitter_username.".xml?count=1"); 
        $xml = new SimpleXMLElement($buffer); 
        $return = $xml->status; 
        return $return->text; 
    } 
	
	// UPDATE STATUS
    public function UpdateStatus($message){ 
    	
		$message = urlencode($message);
		$username = $this->twitter_username;
		$password = $this->twitter_password;
	
		$curl = curl_init(); 
		
		curl_setopt($curl, CURLOPT_URL, "http://twitter.com/statuses/update.xml?status=$message");
		curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1); 
		curl_setopt($curl, CURLOPT_POST, 1); 
		curl_setopt($curl, CURLOPT_USERPWD, "$username:$password"); 
		
		$exec = curl_exec($curl); 
		$http_code_return = curl_getinfo($curl, CURLINFO_HTTP_CODE); 
		$this->HTTP_Code($http_code_return);
		
		curl_close($curl); 
		
		return  $return; 
             
    }
}
... read more

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Twestival Toronto 2010