Custom meta box not saving values of radio buttons in WordPress

Your values are actually being saved – you can always check it in your database.

The problem is in your metabox callback function post_options_callback – it is not being called with Post.ID value as an argument, but WP Post object is being passed. Here’s revisited piece of code:

 function post_options_callback( $post ) {
      $post_id = $post->ID;

I also recommend you to not wrap your function with function_exists check, but prefix them with unique prefix. Eg: my_plugin_ (replacing it with your plugin name) or binda_ (replacing it with you nickname or name).

That way you can be sure that your plugin won’t stop working when you install some other plugin defining a function with same name.

Another approach would be to encapsulate your plugin function into a class.

Note: use unique meta_key names as well (prefix them).

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