save_post action doesn't passing post id to my function as argument

Question

I'm adding a box to add / update post screen.

add_action( 'save_post', 'psd_upload_kaydet' );
add_action( 'add_meta_boxes', 'psd_upload' );
function psd_upload()
{
    add_meta_box("psd-upload", "Bir Dosya Upload Edin", "psd_upload_box", "post");
}
function psd_upload_box($post)
{
    echo "content here";
}
function psd_upload_kaydet($post_id)
{
    die($post_id); // for debugging, i'll explain it
}

There is no error while adding box, but normally, when post saved, add_action( 'save_post', 'psd_upload_kaydet' ); will pass post id as an argument to psd_upload_kaydet()

But it's not passing post it to psd_upload_kaydet() as an argument. I'm checking it die($post_id); , but it's returning just blank page.

In shortly, I need post id in psd_upload_kaydet() :)

Answer 1

die is an alias of exit and from php.net:

void exit ([ string $status ] )

If status is an integer, that value will be used as the exit status and not printed.

Try doing the following instead.

function psd_upload_kaydet($post_id)
{
    echo $post_id;
    die(); // for debugging, i'll explain it
}

edit.