Upload controller

[mihkel100]

How to check if uploaded file is a picture not something else?

if(!$picture){
   die('This is not a picture');
} else {
   // ...
}

And if uploaded picture file name includes symbols (not letters a-z nor _ ) how is the best way to replace them?

I think replace() isn't the best way because there is so many symbols.

[elementaluk]

all uploaded files are put into: $_FILES so say your HTML upload form input is named: userfile

you could check the mime type using:
$_FILES['userfile']['type']

that would return e.g. image/jpeg

or you can use getimagesize e.g.
list($width, $height, $type, $attr) = getimagesize($_FILES['userfile']['tmp_name']);

removing letter from a file name should be pretty easy with str_replace e.g.

$filename = str_replace(array("*","&","£","^{"),"",$filename);}

[devinemke]

You can check $_FILES['userfile']['type'], the mime type of the file, if the browser provided this information. An example would be "image/gif". You can also check the extension:

$pathinfo = pathinfo($_FILES['userfile']['name']);
$extension = $pathinfo['extension'];