create custom meta box with default value

Yea. It seems everything is right. But I would prefer-

if (empty($layout)) {
  $layout = "layout_1";
}

instead of this-

if ($layout == "") {
  $layout = "layout_1";
}

It’s the preferred method to test if the variable is empty or not. And I would also prefer-

if ($layout === "layout_1" ) echo "checked"
if ($layout === "layout_2" ) echo "checked"
if ($layout === "layout_3" ) echo "checked"

Instead of this-

if ($layout == "layout_1" ) echo "checked"
if ($layout == "layout_2" ) echo "checked"
if ($layout == "layout_3" ) echo "checked"

Otherwise it seems quite normal. Hope that helps you.

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