在php中移动上传之前或之后的imagerotate选项

Question

I have a form to upload a picture file, but i want to include an option to rotate the image in the same form.

What im not sure of, is should i rotate the image before saving it, or save it, open it, rotate it, then save it again. Im not sure what is the best method for accomplishing this. The code im using is below:

$imagename = uniqid().".jpg";
if (file_exists("upload/" . $imagename))
    {
        //echo $_FILES["file"]["name"] . " already exists. ";
    } else {
        // Rotate image here before saving?
        move_uploaded_file($_FILES["file"]["tmp_name"],"upload/" . $imagename);
        // Or open/rotate/resave image here?
}

Answer 1

Always move the image first, then manipulate it. There are security restrictions in PHP that make it possible for a system administrator to say that only the move_uploaded_file() function is able to access an uploaded file in the temporary location and no other functions.

So, move it first, then manipulate. Otherwise your script will not work on servers that have this security enabled.