上传图片PHP问题

Question

Hi guys I'm using this code http://www.w3schools.com/php/php_file_upload.asp to upload files and it works great but now I'm doing a form with an optional image and it won't let me upload. It says it's an invalid file format since it's no file at all. How do I check if there is a file to upload or not and then skip the upload script if there is none?

Thanks!

Note: I have removed the size limitation from the script if that makes any differance.

Answer 1

if ($_FILES['nameofyourfileinput']['error'] === UPLOAD_ERR_OK) {
   ... file has been uploaded and everything went ok ...
} else if ($_FILES['nameofyourfieinput']['error'] !== UPLOAD_ERR_NO_FILE) {
   ... something OTHER than a 'no file was uploaded' error has occured...
}

Upload error codes defined here.