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<form action="" method="post" enctype="multipart/form-data">
<input type="file" name="image_file" />
<input type="submit" value="Send Image" />
</form>

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if(isset($_FILES['image_file']))
{
	$max_size = 500; //max image size in Pixels
	$destination_folder = '/root/path/to/image/files';
	
	$image_name = $_FILES['image_file']['name']; //file name
	$image_size = $_FILES['image_file']['size']; //file size
	$image_temp = $_FILES['image_file']['tmp_name']; //file temp
	$image_type = $_FILES['image_file']['type']; //file type


	switch(strtolower($image_type)) //determine uploaded image type 
		{
			//Create new image from file
			case 'image/png': 
				$image_resource =  imagecreatefrompng($image_temp);
				break;
			case 'image/gif':
				$image_resource =  imagecreatefromgif($image_temp);
				break;          
			case 'image/jpeg': case 'image/pjpeg':
				$image_resource = imagecreatefromjpeg($image_temp);
				break;
			default:
				$image_resource = false;
		}
	
	if($image_resource){
		//Copy and resize part of an image with resampling
		list($img_width, $img_height) = getimagesize($image_temp);
		
	    //Construct a proportional size of new image
		$image_scale        = min($max_size / $img_width, $max_size / $img_height); 
		$new_image_width    = ceil($image_scale * $img_width);
		$new_image_height   = ceil($image_scale * $img_height);
		$new_canvas         = imagecreatetruecolor($new_image_width , $new_image_height);

	    //resize image with new height and width
		if(imagecopyresampled($new_canvas, $image_resource ,0, 0, 0, 0, $new_image_width, $new_image_height, $img_width, $img_height))
		{
			
			if(!is_dir($destination_folder)){ //create dir if it doesn't exist
				echo (mkdir($destination_folder))?'New folder Created':'Could create new folder';
			}
			
			//Save as jpeg image file
			switch(strtolower($image_type))
				{
					case 'image/png':
						imagepng($new_canvas, $destination_folder.'/'.$image_name);
						break;
					case 'image/gif':
						imagegif($new_canvas, $destination_folder.'/'.$image_name);
						break;          
					case 'image/jpeg': case 'image/pjpeg':
						imagejpeg($new_canvas, $destination_folder.'/'.$image_name, 80);
						break;
				}
		}
	}
}