Revealing Post Ids

custom-post-hooks.php

$custom_post_types = get_post_types( 
   array( 
      'public'   => true, 
      '_builtin' => false 
   ), 
   'names'
); 

foreach ( $custom_post_types as $post_type ) {
	add_action( 'manage_edit-'. $post_type . '_columns', 'revealid_add_id_column' );
	add_filter( 'manage_'. $post_type . '_custom_column', 'revealid_id_column_content' );
}

custom-taxonomy-hooks.php

$taxonomies = get_taxonomies();

foreach ( $taxonomies as $taxonomy ) {
	add_action( 'manage_edit-' . $taxonomy . '_columns', 'revealid_add_id_column' );
	add_filter( 'manage_' . $taxonomy . '_custom_column', 'revealid_id_column_content' );
}

id-first.php

function revealid_add_id_column( $columns ) {
	$checkbox = array_slice( $columns , 0, 1 );
	$columns = array_slice( $columns , 1 );

	$id['revealid_id'] = 'ID';
	
	$columns = array_merge( $checkbox, $id, $columns );
	return $columns;
}

post-hooks.php

add_filter( 'manage_posts_columns', 'revealid_add_id_column' );
add_action( 'manage_posts_custom_column', 'revealid_id_column_content' );
add_filter( 'manage_pages_columns', 'revealid_add_id_column' );
add_action( 'manage_pages_custom_column', 'revealid_id_column_content' );
add_filter( 'manage_media_columns', 'revealid_add_id_column' );
add_action( 'manage_media_custom_column', 'revealid_id_column_content' );
add_filter( 'manage_project_columns', 'revealid_add_id_column' );
add_action( 'manage_project_custom_column', 'revealid_id_column_content' );

test.php

add_filter( 'manage_posts_columns', 'revealid_add_id_column' );
add_action( 'manage_posts_custom_column', 'revealid_id_column_content' );

function revealid_add_id_column( $columns ) {
   $columns['revealid_id'] = 'ID';
   return $columns;
}

function revealid_id_column_content( $column, $id ) {
  if( 'revealid_id' == $column ) {
    echo $id;
  }
}

users-comments.php

add_action( 'manage_users_columns', 'revealid_add_id_column' );
add_filter( 'manage_users_custom_column', 'revealid_id_column_content' );
add_action( 'manage_edit-comments_columns', 'revealid_add_id_column' );
add_action( 'manage_comments_custom_column', 'revealid_id_column_content' );