1mb = 1,048,576 bytes

2mb = 1,048,576x2= 2,097,152 bytes

if maximum upload size 2mb 

$name= $_FILES['file']['name'];

$tmp_name= $_FILES['file']['tmp_name'];

$size= $_FILES['file']['size'];

$path= "Uploads/Files/";

if ($size < 2097152)
{
move_uploaded_file($tmp_name, $path . $name);
echo 'Uploaded!';
}