PHP - Function Resize Images

ฟังก์ชั่นนี้ได้จากไปนั่งเรียนมาค่ะ ลองดูนะค่ะ

<?

function resize_photo($tmp,$newname,$folder,$new_height){

$newname = strtolower($newname);

$arr_name = explode(".",$newname);

$lastname = $arr_name[sizeof($arr_name)-1];

// $newname = time().".".$lastname;

$file = getimagesize($tmp);

if ($file[1]>$new_height){

//copy($tmp,"photo/".$newname);

if ($lastname=="jpg" || $lastname=="jpeg"){

$file = getimagesize($tmp);

$newheight = $new_height;

$newwidth = round($newheight*$file[0]/$file[1]);

$newimage = imagecreatefromjpeg($tmp);

$imagex = imagesx($newimage);

$imagey = imagesy($newimage);

$image_fin =imagecreatetruecolor($newwidth,$newheight);

imagecopyresampled($image_fin,$newimage,0,0,0,0,$newwidth+1,$newheight+1,$imagex,$imagey);

imagejpeg($image_fin,$folder."/".$newname);

imagedestroy($newimage);

imagedestroy($image_fin);

}elseif ($lastname=="gif"){

$file = getimagesize($tmp);

$newheight = $new_height;

$newwidth = round($newheight*$file[0]/$file[1]);

$newimage = imagecreatefromgif($tmp);

$imagex = imagesx($newimage);

$imagey = imagesy($newimage);

$image_fin =imagecreatetruecolor($newwidth,$newheight);

imagecopyresampled($image_fin,$newimage,0,0,0,0,$newwidth+1,$newheight+1,$imagex,$imagey);

imagegif($image_fin,$folder."/".$newname);

imagedestroy($newimage);

imagedestroy($image_fin);

}

}else{

move_uploaded_file($tmp,$folder."/".$newname);

}

return $newname;

}

?>