<fieldset style="width: 90%;">

   <legend>Test key</legend>

<form method="post" action="test.php">

NAME:<input type="text" name="KOD"  value="<?PHP echo $_POST['KOD'];?>" size="50"><br>

FILE:<input type="file" name="FILE"><br>

<button type="submit">SUBMIT</button><br>

</form>

 

<?PHP

function gen($input){

        $im = imagecreatetruecolor(125, 125);

        return $im;

        imagedestroy($im);

 

 

 

if (file_get_contents($_FILES['FILE']['tmp_name'])==file_get_contents(gen($_POST['KOD']))){echo '1';}else{echo '0';}

   </fieldset>