I'm looking to create a WordPress secondary featured image. I started looking at a custom post type of attachment but is it possible to add a custom port type image on a regular post?

  • Possible duplicate of How can I add an image upload field directly to a custom write panel? Generally perform a search for »image upload meta box« or similar, as this has been answered numerous times. – Nicolai Mar 6 '18 at 20:06
  • @Nicolai DEV access to if ( ! function_exists( 'wp_handle_upload' ) ) require_once( ABSPATH . 'wp-admin/includes/file.php' ); is restricted by security – php_needs Mar 6 '18 at 20:39
  • What are you talking about, this is not even part of the answer, which is working just fine. – Nicolai Mar 6 '18 at 20:51

I don't want to use the many available plugins or a custom field.

Even a code only solution would use a custom field for this.

It's metadata about the post, so you use a custom field for it. That's what custom fields are.

Also, the code for your custom solution would live in a plugin, because that's where you put custom solutions.

So, as it stands, there is no answer to your question, because you placed restrictions on it that prevent any viable answer from being correct.

  • No Plugin is a requirement – php_needs Mar 6 '18 at 20:37
  • Then there is no answer. All custom code goes into plugins. That's what plugins are. – Otto Mar 7 '18 at 12:36

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