Wordpress Custom Post Type Pagination

Custom post types in wordpress enables developers to do lot of things. But, when it comes to paginating it - lot of people struggle. I searched the web for the solution but could not find proper solution. So, thought of finding it on my own.

So, I created a custom post type called 'projects'.

Copy the following code in your functions.php

add_action('init', 'projects_init');
function projects_init() 
{
$project_labels = array(
'name' => _x('Projects', 'post type general name'),
'singular_name' => _x('Projects', 'post type singular name'), 
'all_items' => __('All projects'),
'add_new' => _x('Add new project', 'project'),
'add_new_item' => __('Add new project'),
'edit_item' => __('Edit project'),
'new_item' => __('New project'),
'view_item' => __('View project'),
'search_items' => __('Search in projects'),
'not_found' =>  __('No projects found'),
'not_found_in_trash' => __('No projects found in trash'), 
'parent_item_colon' => ''
);
$args = array(
'labels' => $project_labels,
'public' => true,
'publicly_queryable' => true,
'show_ui' => true, 
'query_var' => true,
'rewrite' => true,
'capability_type' => 'post',
'hierarchical' => false,
'menu_position' => 5,
'supports' => array('title', 'editor','thumbnail'),
'has_archive' => 'projects'
); 
register_post_type('projects',$args);
}

Now, create a template called 'Projects' and assign it to a page.

and copy the following code into it.

<?php 
  /*
  Template Name: Projects
  */
  get_header();
  $temp = $wp_query; 
  $wp_query = null; 
  $wp_query = new WP_Query(); 
  $show_posts = 4;  //How many post you want on per page
  $permalink = 'Post name'; // Default, Post name
  $post_type = 'projects';
  
  //Know the current URI
  $req_uri =  $_SERVER['REQUEST_URI'];  
  
  //Permalink set to default
  if($permalink == 'Default') {
  $req_uri = explode('paged=', $req_uri);
  
  if($_GET['paged']) {
  $uri = $req_uri[0] . 'paged='; 
  } else {
  $uri = $req_uri[0] . '&paged=';
  }
  //Permalink is set to Post name
  } elseif ($permalink == 'Post name') {
  if (strpos($req_uri,'page/') !== false) {
  $req_uri = explode('page/',$req_uri);
  $req_uri = $req_uri[0] ;
  }
  $uri = $req_uri . 'page/';
  
  }
  
  //Query
  $wp_query->query('showposts='.$show_posts.'&post_type='. $post_type .'&paged='.$paged); 
  //count posts in the custom post type
 $count_posts = wp_count_posts('projects');

  while ($wp_query->have_posts()) : $wp_query->the_post(); 
  ?>
  <!--Do stuff-->
  <h1>
  <?php the_title(); ?>
  </h1>
  <?php the_content(); ?>
  <?php endwhile;?>
  <nav>
  <?php previous_posts_link('&laquo; ') ?>
  <?php
  $count_post = $count_posts->publish / $show_posts;
  
  if( $count_posts->publish % $show_posts == 1 ) {
  $count_post++;
  $count_post = intval($count_post);
  };
  
  for($i = 1; $i <= $count_post ; $i++) { ?>
  <a <?php if($req_uri[1] == $i) { echo 'class=active_page'; } ?> href="<?php echo $uri . $i; ?>"><?php echo $i; ?></a>
  <?php }
  ?>
  <?php next_posts_link(' &raquo;') ?>
  </nav>

  <?php 
  $wp_query = null; 
  $wp_query = $temp;  // Reset
  
  get_footer();
  ?>

In the above code, you should modify the $permalink variable to the current permalink type. I tested only with 'Default' and 'Post name' permalinks.

Also, modify the $post_type variable to the custom post type name.