metabox - Post and Pages section inside WordPress admin are completely blank

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Meta Tags - Undefined array due to meta tags!

I have created my own custom post meta tags but all works fine until I test my WordPress theme on the new WordPress Installation.

What I came through after the new WordPress installation, I have activated my theme, and when I try to open post or pages section inside WordPress admin. It triggers an errors

1. Warning: Undefined array key "your_meta_box_nonce"

I solved it by adding -> [ isset($_POST['your_meta_box_nonce']) && ] inside first condition

function save_your_fields_meta( $post_id ) {
  // verify nonce
  if ( [ --Added Here-- ] !wp_verify_nonce( $_POST['your_meta_box_nonce'], basename(__FILE__) ) ) {
    return $post_id;
  }
  
}
add_action( 'save_post', 'save_your_fields_meta' );

2. Warning: Undefined array key "post_type" and Warning: Undefined array key "your_fields"

I soved it by adding -> [ isset($_POST['post_type']) && ]

// check permissions
  if ( [ --Added Here-- ] 'page' === $_POST['post_type'] ) {
    if ( !current_user_can( 'edit_page', $post_id ) ) {
      return $post_id;
    } elseif ( !current_user_can( 'edit_post', $post_id ) ) {
      return $post_id;
    }
  }

and -> [ isset($_POST['your_fields']) && ]

if ( [ --Added Here-- ] $_POST['your_fields'] !== $old ) {
    update_post_meta( $post_id, 'your_fields', $_POST['your_fields'] );
  } elseif ( isset($_POST['your_fields']) && '' === $_POST['your_fields'] && $old ) {
    delete_post_meta( $post_id, 'your_fields', $old );
  }

Errors are solved but the page is completely blank.

Below is my full code of the meta save_post function

Update -:

I have checked my code again and set my define(‘WP_DEBUG’, true); but it still does not show an error means the blank page.

So I tried to hide my code and when I did it. I found that when I set priority to default, core, high, low it triggers gets blank but when I set priority to any numeric value it appears again but obesity it did not display the custom meta box

Below is the complete code of my custom meta field.

本文标签： metaboxPost and Pages section inside WordPress admin are completely blank