Here is my code:
<html>
<body>
<div>
<form action="<?=$_SERVER['PHP_SELF'];?>" method="post">
<input type="file" id="myFile" name="filename">
<input type="submit" name="Submit">
</form>
</div>
<?php
if(isset($_POST['Submit']))
{
$file = $_POST["myFile"];
echo("hello");
}
?>
</body>
</html>
when I run it and input a file it says: Undefined array key “myFile”
what am I doing wrong?