<form action="file.php" method="post" enctype="multipart/form-data">
<input type="file" name="img" />
<input type="submit" />
</form>

<?php
$file = $_FILES['img']['name'];
move_uploaded_file($_FILES['img']['tmp_name'], 'imgs/pict.jpg');
?>

<?php  
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://www.test1.ru/upload.php');
curl_setopt($ch, CURLOPT_HEADER, 0);  
curl_setopt($ch, CURLOPT_VERBOSE, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);  
curl_setopt($ch, CURLOPT_USERAGENT, "Mozilla/4.0 (compatible;)");  
curl_setopt($ch, CURLOPT_POST, true);
$post = array("img"=>"@C:/image/image.jpg");  
curl_setopt($ch, CURLOPT_POSTFIELDS, $post);    
$response = curl_exec($ch);
echo $response;
?>