convert upload to jpeg

[nuttynibbles]

hi, im doing a multiple upload. everything works well except that it only allows upload of jpeg. the reason is because of the cropimage function i did. it accept imagecreatefromjpeg. knowing from this, is there a way to convert all $_FILES['file']['tmp_name'] to jpeg before croping?? in that way i wont face any problem with having images not a jpeg.

$n=0;
			$file_array=array();

		foreach($_FILES['file']['tmp_name'] as $k=>$v){
			if($v){
				$preupload=$v;
				$finalupload=$this->uploadobj->cropimage($preupload,300);

				$filename=date('ymdGis').$n.'.gif';
				$target='uploads/'.$filename;
				if(!copy($finalupload, $target))
					$this->error='Your photo was not uploaded successfully';
				else{
					$file_array[$n]=$filename;
				}
				$n++;
			}			

function cropimage($upload,$ratio=0)
	{
		$src = imagecreatefromjpeg($upload);	

	list($width,$height)=getimagesize($upload);
	list($newwidth,$newheight)=Kgcupload::resizeratio($ratio,$width,$height);
	if(!$newwidth && !$newheight)
		return;

	$tmp=imagecreatetruecolor($newwidth,$newheight);
	imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);
	$finalupload = $upload;
	imagejpeg($tmp,$finalupload,100);

	imagedestroy($src);
	imagedestroy($tmp);

	return $finalupload;
}

function resizeratio($newwidth=0,$width=0,$height=0)
{
	if(!$newwidth || $newwidth==NULL || $newwidth=="")
		return NULL;

	$array_size=array();	
	$percentage='';
	$newheight='';

	if(($width > $newwidth) || ($height > $newwidth)){
		if($width > $height)
			$percentage=($newwidth/$width);
		else
			$percentage=($newwidth/$height);

		$newwidth = round($width * $percentage);
		$newheight = round($height * $percentage); 
	}
	else{
		$newwdith=$width;
		$newheight=$height;
	}

	$array_size[]=$newwidth;
	$array_size[]=$newheight;

	return $array_size;
}

[NogDog]

You could use a function like the following, and then replace the call to imagecreatejpeg() in your code to call this function, instead.

/**
 * Create a GD image from a specified file
 * @return mixed GD image resource on success, boolean false on failure
 * @param string Source image file
 **/
function createGdImage($file)
{
   $imageType = exif_imagetype($file);
   if($imageType === false)
   {
      user_error("Unable to get image type for '$file'");
      return false;   

   }
   switch($imageType)
   {
      case IMAGETYPE_GIF:
         $gdImage = imagecreatefromgif($file);
         break;
      case IMAGETYPE_JPEG:
         $gdImage = imagecreatefromjpeg($file);
         break;
      case IMAGETYPE_PNG:
         $gdImage = imagecreatefrompng($file);
         break;
      case IMAGETYPE_WBMP:
         $gdImage = imagecreatefromwbmp($file);
         break;
      default:
         $gdImage = false;
   }
   if($gdImage === false)
   {
      user_error("'$file' is not an image or not a supported type");   

   }
   return $gdImage;
}

(Adjust the cases as needed to reflect the image types that your PHP installation supports and that you want to allow users to upload.)

[Weedpacket]

You could also read the file into memory and use [man]imagecreatefromstring[/man], although that can make for significantly more use of memory.