Product_per_page_function.php

<?php
// Catalog Page Ordering
// now we set our cookie if we need to
function dl_sort_by_page($count) {
  if (isset($_COOKIE['shop_pageResults'])) { // if normal page load with cookie
     $count = $_COOKIE['shop_pageResults'];
  }
  if (isset($_POST['woocommerce-sort-by-columns'])) { //if form submitted
    setcookie('shop_pageResults', $_POST['woocommerce-sort-by-columns'], time()+1209600, '/', 'www.your-domain-goes-here.com', false); //this will fail if any part of page has been output- hope this works!
    $count = $_POST['woocommerce-sort-by-columns'];
  }
  // else normal page load and no cookie
  return $count;
} 
add_filter('loop_shop_per_page','dl_sort_by_page');

function rideo_woocommerce_catalog_page_ordering() {
?>
    <form action="" method="POST" name="results" class="woocommerce-ordering">
    	
    	<select name="woocommerce-sort-by-columns" id="woocommerce-sort-by-columns" class="form-control" onchange="this.form.submit()">
			<?php
			 
			//Get products on page reload
			if  (isset($_POST['woocommerce-sort-by-columns']) && (($_COOKIE /*['shop_pageResults'] Undefind Index*/ <> $_POST['woocommerce-sort-by-columns']))) {
			        $numberOfProductsPerPage = $_POST['woocommerce-sort-by-columns'];
			          } else {
			        $numberOfProductsPerPage = $_COOKIE['shop_pageResults'];
			          }
			 
			//  This is where you can change the amounts per page that the user will use  feel free to change the numbers and text as you want, in my case we had 4 products per row so I chose to have multiples of four for the user to select.
						$shopCatalog_orderby = apply_filters('woocommerce_sortby_page', array(
						//Add as many of these as you like, -1 shows all products per page
						  //  ''       => __('Results per page', 'rideo'),
							'3' 		=> __('3', 'rideo'),
							'6' 		=> __('6', 'rideo'),
							'9' 		=> __('9', 'rideo'),
							'12' 		=> __('12', 'rideo'),
							'18' 		=> __('18', 'rideo'),
							'-1' 		=> __('All', 'rideo'),
						));

					foreach ( $shopCatalog_orderby as $sort_id => $sort_name )
						echo '<option value="' . $sort_id . '" ' . selected( $numberOfProductsPerPage, $sort_id, true ) . ' >' . $sort_name . '</option>';
			?>
		</select>
	</form>
<?php
}

// Catalog Page Ordering