WordPress Plugin - Admin Post list table filter using post meta values

admin_posts_list_filter.php

<?php
/*
Plugin Name: Admin Filter BY Custom Fields
Version: 1.0
Author: Mohammad Mursaleen
*/

add_action( 'restrict_manage_posts', 'obj_admin_posts_filter_restrict_manage_posts' );
/**
 * First create the dropdown
 * make sure to change POST_TYPE to the name of your custom post type
 * @author Mohammad Mursaleen
 * @return void
 */
function obj_admin_posts_filter_restrict_manage_posts(){
    $type = 'POST_TYPE';
    if (isset($_GET['post_type'])) {
        $type = $_GET['post_type'];
    }

    //only add filter to post type you want
    if ('POST_TYPE' == $type){
        //change this to the list of values you want to show
        //in 'label' => 'value' format
        $values = array(
            'archive' => 'Archive',
            'active' => 'Active',
            'inactive' => 'Inactive',
        );
        ?>
        <select name="ADMIN_FILTER_FIELD_VALUE">
            <option value=""><?php _e('Filter By Status', 'Status'); ?></option>
            <?php
            $current_v = isset($_GET['ADMIN_FILTER_FIELD_VALUE'])? $_GET['ADMIN_FILTER_FIELD_VALUE']:'';
            foreach ($values as $value=> $label ) {
                printf
                (
                    '<option value="%s"%s>%s</option>',
                    $value,
                    $value == $current_v? ' selected="selected"':'',
                    $label
                );
            }
            ?>
        </select>
    <?php
    }
}


add_filter( 'parse_query', 'obj_posts_filter' );
/**
 * if submitted filter by post meta
 *
 * make sure to change status to the actual meta key
 * and POST_TYPE to the name of your custom post type
 * @author Mohammad Mursaleen
 * @param  (wp_query object) $query
 *
 * @return Void
 */
function obj_posts_filter( $query ){
    global $pagenow;
    $type = 'POST_TYPE';
    if (isset($_GET['post_type'])) {
        $type = $_GET['post_type'];
    }
    if ( 'POST_TYPE' == $type && is_admin() && $pagenow=='edit.php' && isset($_GET['ADMIN_FILTER_FIELD_VALUE']) && $_GET['ADMIN_FILTER_FIELD_VALUE'] != '') {
        $query->query_vars['meta_key'] = 'status';
        $query->query_vars['meta_value'] = $_GET['ADMIN_FILTER_FIELD_VALUE'];
    }
}