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/**
 * Return the post type for admin pages
 */
class Return_Admin_Post_Type {

    /**
     * Initialize the class and set its properties.
     */
    public function __construct( $post_type = array() ) {
        $this->get_post_type();
    }
    
    /**
     * Determine the type of page and return it's post type
     * 
     * @return string the post type
     * @global $post
     * @global $typenow
     * @global $current_screen
     * @global $pagenow
     */
    public function get_post_type() {
    
        global $post, $typenow, $current_screen, $pagenow;

        if($post && $post->post_type) {
            return $post->post_type;
        } elseif($typenow) {
            return $typenow;
        } elseif($current_screen && $current_screen->post_type) {
            return $current_screen->post_type;
        } elseif(isset($_REQUEST['post_type'])) {
            return sanitize_key( $_REQUEST['post_type'] );
        } elseif(!isset($_REQUEST['post_type']) && $pagenow == 'edit.php' ) {
            return 'post';
        } elseif(!isset($_REQUEST['post_type']) && $pagenow == 'post-new.php' ) {
            return 'post';
        } elseif(isset($_GET['post'])) {
            $thispost = get_post($_GET['post']);
            return $thispost->post_type;
        } else {
            return null;
        }
        
    }
}
/**
 * Initialize the class
 *
 * @example $variable = new Return_Admin_Post_Type();;
 */
/**
 * Call the function
 *
 * @example $working_variable = $variable->get_post_type();
 */