Upload image PHP problem

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.

Well it has some good info for beginners, but otherwise i kinda agree with these guys: w3fools.com — TJHeuvel
– TJHeuvel, Commented Aug 15, 2011 at 15:32
Haha, I guess it't not the most advanced stuff in the world but I didn't understand anything on the other sites I found so... — Alex
– Alex, Commented Aug 15, 2011 at 15:36
BTW Thanks for the heads up cuz I thought was a part af W3C just becouse of it's name. — Alex
– Alex, Commented Aug 15, 2011 at 15:52

Marc B · Accepted Answer · 2011-08-15 15:31:17Z

2

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.

answered Aug 15, 2011 at 15:31

Marc B

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2 Comments

Alex Over a year ago

What does three = in a row mean?

Marc B Over a year ago

php.net/manual/en/language.operators.comparison.php It's the "strict comparison". compares type AND value. PHP evaluates 0 == false as true because false will convert to 0 (or 0 to false). saying 0 === false will fail, because the types of the two are different, even if the values come out the same.

TJHeuvel · Accepted Answer · 2011-08-15 15:30:13Z

0

Just check if the file's error code isnt 4; http://php.net/manual/en/features.file-upload.errors.php

answered Aug 15, 2011 at 15:30

TJHeuvel

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