Show the post, page id in the admin screens

_admin-post-columns_id.php

<?php 
add_filter('manage_posts_columns', 'posts_columns_id', 5); 
add_action('manage_posts_custom_column', 'posts_custom_id_columns', 5, 2); 
add_filter('manage_pages_columns', 'posts_columns_id', 5); 
add_action('manage_pages_custom_column', 'posts_custom_id_columns', 5, 2); 
function posts_columns_id($defaults){ $defaults['make_post_id'] = __('ID'); 
	return $defaults; 
} 
function posts_custom_id_columns($column_name, $id){ 
	if($column_name === 'make_post_id'){ 
		echo $id; 
	} 
}