isset/empty help

[garfx]

Hello i'm using the following code

move_uploaded_file($_FILES['imagefile']['tmp_name'],"latest.img");
    $instr = fopen("latest.img","rb");
    $image = addslashes(fread($instr,filesize("latest.img")));

i would like $image to equal "" or 0 if $imagefile is not passed

something like:

if(empty($_FILES['imagefile'])) {

$image = '';

} else {

move_uploaded_file($_FILES['imagefile']['tmp_name'],"latest.img");
    $instr = fopen("latest.img","rb");
    $image = addslashes(fread($instr,filesize("latest.img")));

}

the above is not working

please help

[laserlight]

How does it not work?

[garfx]

if $_FILES['imagefile'] is blank the $image is not set to "" or 0