Get the current post showing from and to results in a page ?

Codes below will show you the how to get the current number of post shows from and to results in a page.

Example :

Showing 01 – 10 post of blog category
Showing 11 – 20 post of blog category
Showing 21 – 29 post of blog category

/*---------------------------------------------------------------------
* $current_page_number default is 1. 
	Example : 
    	page number 3 http://site.com/category/blog/page/2/
    	page number 3 http://site.com/category/blog/page/3/
* $post_per_page is the number of post displayed in a blog category. 
	Example :
    	5 per page.
    	10 per page.
    	15 per page.
* $all_post is a overall total number of post under blog category. 
	Example :
    	we 23 post in blog category. $all_post will return you the 23 post.
    	we 33 post in blog category. $all_post will return you the 33 post.
---------------------------------------------------------------------*/
$page = $current_page_number * $post_per_page; 
if( $current_page_number > 1 ){
  	$results_from = ( $post_per_page * ( $current_page_number - 1 ) ) + 1; 
}else{
  	$s_from = $current_page_number; 
} 
if( $page > $all_post ){
  	$results_to = $all_post; 
}else{
  	$results_to = $post_per_page * $current_page_number; 
}