แนะนำหน่อยคับ error แบบนี้ Warning: trim() expects parameter 1 to be string (Unicode or binary),

	if(trim($_FILES['fileupload2'])!== ""){
$fileupload2=$_FILES['fileupload2']['tmp_name'];
$fileupload_name2= $_FILES['fileupload2']['name'];
$fileupload_size2= $_FILES['fileupload2']['size'];
$fileupload_type2= $_FILES['fileupload2']['type'];
$type2=$_POST[type];
$ext2=strtolower(end($a=explode('.', $fileupload_name2)));
		if ($ext2==""){
				} else {
			if ($ext2=="jpg" or $ext2=="jpeg" ) {
		   $ori_img2= imagecreatefromjpeg($fileupload2);
		   }else if ($ext2=="png"){
		   $ori_img2= imagecreatefrompng($fileupload2);
		    }else if ($ext2=="gif") {
			  $ori_img2= imagecreatefromgif($fileupload2);
			  }
			  $ori_size2=getimagesize($fileupload2);
			  $ori_w2= $ori_size2[0];
			   $ori_h2= $ori_size2[1];
			   if($ori_w2>=$ori_h2) {
			        $new_w2=100;
					$new_h2=round(($new_w2/$ori_w2)* $ori_h2);
					}else{
					$new_h2=75;
					$new_w2=round(($new_h2/$ori_h2)* $ori_w2);
					}
					$new_img2= imagecreatetruecolor($new_w2, $new_h2);
					imagecopyresized ($new_img2, $ori_img2,0,0,0,0,$new_w2,$new_h2,$ori_w2,$ori_h2);
					$PicName2 = "logo".$ID.".".$ext2;
					if ($ext2=="jpg" or $ext2=="jpeg" ) {
					    imagejpeg($new_img2, "../img_banner/$PicName2");
						}else if ($ext2=="png") {
						imagepng($new_img2," ../img_banner/$PicName2");
						}else if ($ext2=="gif") {
						copy($fileupload2,"../img_banner/$PicName2");
						}
						imagedestroy($ori_img2);
						imagedestroy($new_img2);
						$Sq = "Update db_banner Set banner ='".$PicName2."'  Where banner_id = '".$ID."'";
						mysql_query($Sq);
		}