googleda 3 kelime aratarak aşağıdakini bulmak mümkün denemedim ama bir kaçtane daha vardı böyle.

<?php
class ImageShack {
static function mimeType($filename){
    $ext = pathinfo($filename);
    $ext = $ext['extension'];
    switch($ext){        
	case "bmp":            
	return "image/bmp";           
	break;        
	case "gif":            
	return "image/gif";            
	break;        
	case "jpe":            
	return "image/jpeg";           
	break;     
	case "jpeg":     
	return "image/jpeg";         
	break;    
    case "jpg":   
	return "image/jpeg";         
	break;   
	case "png":     
	return "image/png";     
	break;      
	case "swf":    
	return "application/x-shockwave-flash";   
	break;      
	case "tif":        
    return "image/tiff";  
	break;     
	case "tiff": 
	return "image/tiff";     
	break;    
    default:      
	return "";            break; 
	 }
	}
	static function upload($file){
	$filename = $file['name'];
   	$binarydata = file_get_contents($file['tmp_name']);
    $sock = @fsockopen("www.imageshack.us", 80, $errno, $errstr, 30);
    $mimetype = self::mimeType($filename);    $AaB03x = "--AaB03x\r\n";
    $AaB03x .= "content-disposition: form-data; name=\"uploadtype\"\r\n\r\n";
    $AaB03x .= "on\r\n";
    $AaB03x .= "--AaB03x\r\n";
    $AaB03x .= "content-disposition: form-data; name=\"fileupload\"; filename=\"".basename($filename)."\"\r\n";
    $AaB03x .= "Content-Type: $mimetype\r\n";
    $AaB03x .= "Content-Transfer-Encoding: binary\r\n\r\n";
    $AaB03x .= "$binarydata\r\n";
    $AaB03x .= "--AaB03x--\r\n";
    $header = "POST / HTTP/1.1\r\n";
    $header .= "Host: www.imageshack.us\r\n";
    $header .= "Content-type: multipart/form-data, boundary=AaB03x\r\n";
    $header .= "Content-Length: ".strlen($AaB03x)."\r\n\r\n"; 
	$header .= $AaB03x; 
	fwrite($sock, $header);		
	$response = '';  
	while (!feof($sock)){  
	$response .= fgets($sock, 128);  
	}  
	fclose($sock);  
	preg_match("/location: http:\/\/img\d{1,3}\.imageshack\.us\/content\.php\?page=done&l=(img\d{1,3})\/(\d{1,4})\/(\w+.\w+)/i", $response, $matches);    
	return "{$matches[1]}.imageshack.us/{$matches[1]}/{$matches[2]}/{$matches[3]}";}}
?>

<?
echo ImageShack::upload("resim.jpg");
?>