This WordPress code snippet set the number of posts per pages depending the page

Wordpress Number of Posts Per Page

/**
 * This WordPress code snippet set the number of posts per pages depending the page
 *
 * Author: Oscar Abad Folgueira
 * Author URI: http://www.oscarabadfolgueira.com
 *
 * You can copy this snippet and paste in your functions.php or you can build your own plugin
 *
 * Change the number of posts per page on each case.
 */

function number_of_posts_per_page( $number ) {
    if ( is_home() ) {
		$number->set( 'posts_per_page', 15 );
		} elseif ( is_category() ) {
			$number->set( 'posts_per_page', 10 );
		} elseif ( is_tag() ) {
			$number->set( 'posts_per_page', 12 );
		} elseif ( is_author() ) {
			$number->set( 'posts_per_page', 10 );
		} elseif ( is_search() ) {
			$number->set( 'posts_per_page', 15 );
		} elseif ( is_archive() ) {
			$number->set( 'posts_per_page', 15 );
		}
	
} // End of number_of_posts_per_page()  function

// Action for set the number of posts per page    
add_action('pre_get_posts', 'number_of_posts_per_page');