functions.php

<?php
/**
 * Underscore Pets functions and definitions.
 *
 * @link https://developer.wordpress.org/themes/basics/theme-functions/
 *
 * @package Underscore_Pets
 */

if ( ! function_exists( 'underscore_pets_setup' ) ) :
/**
 * Sets up theme defaults and registers support for various WordPress features.
 *
 * Note that this function is hooked into the after_setup_theme hook, which
 * runs before the init hook. The init hook is too late for some features, such
 * as indicating support for post thumbnails.
 */
function underscore_pets_setup() {
	/*
	 * Make theme available for translation.
	 * Translations can be filed in the /languages/ directory.
	 * If you're building a theme based on Underscore Pets, use a find and replace
	 * to change 'underscore-pets' to the name of your theme in all the template files.
	 */
	load_theme_textdomain( 'underscore-pets', get_template_directory() . '/languages' );

	// Add default posts and comments RSS feed links to head.
	add_theme_support( 'automatic-feed-links' );

	/*
	 * Let WordPress manage the document title.
	 * By adding theme support, we declare that this theme does not use a
	 * hard-coded <title> tag in the document head, and expect WordPress to
	 * provide it for us.
	 */
	add_theme_support( 'title-tag' );

	/*
	 * Enable support for Post Thumbnails on posts and pages.
	 *
	 * @link https://developer.wordpress.org/themes/functionality/featured-images-post-thumbnails/
	 */
	add_theme_support( 'post-thumbnails' );

	// This theme uses wp_nav_menu() in one location.
	register_nav_menus( array(
		'primary' => esc_html__( 'Primary', 'underscore-pets' ),
	) );

	/*
	 * Switch default core markup for search form, comment form, and comments
	 * to output valid HTML5.
	 */
	add_theme_support( 'html5', array(
		'search-form',
		'comment-form',
		'comment-list',
		'gallery',
		'caption',
	) );

	/*
	 * Enable support for Post Formats.
	 * See https://developer.wordpress.org/themes/functionality/post-formats/
	 */
	add_theme_support( 'post-formats', array(
		'aside',
		'image',
		'video',
		'quote',
		'link',
	) );

	// Set up the WordPress core custom background feature.
	add_theme_support( 'custom-background', apply_filters( 'underscore_pets_custom_background_args', array(
		'default-color' => 'ffffff',
		'default-image' => '',
	) ) );
}
endif;
add_action( 'after_setup_theme', 'underscore_pets_setup' );

/**
 * Set the content width in pixels, based on the theme's design and stylesheet.
 *
 * Priority 0 to make it available to lower priority callbacks.
 *
 * @global int $content_width
 */
function underscore_pets_content_width() {
	$GLOBALS['content_width'] = apply_filters( 'underscore_pets_content_width', 640 );
}
add_action( 'after_setup_theme', 'underscore_pets_content_width', 0 );

/**
 * Register widget area.
 *
 * @link https://developer.wordpress.org/themes/functionality/sidebars/#registering-a-sidebar
 */

function pagination($pages = '', $range = 4)
{  
     $showitems = ($range * 2)+1;  
 
     global $paged;
     if(empty($paged)) $paged = 1;
 
     if($pages == '')
     {
         global $wp_query;
         $pages = $wp_query->max_num_pages;
         if(!$pages)
         {
             $pages = 1;
         }
     }   
 
     if(1 != $pages)
     {
         echo "<div class=\"pagination\">";
         previous_posts_link();
         echo "<span>Page ".$paged." of ".$pages."</span>";
         if($paged > 2 && $paged > $range+1 && $showitems < $pages) echo "<a href='".get_pagenum_link(1)."'>&laquo; First</a>";
         if($paged > 1 && $showitems < $pages) echo "<a href='".get_pagenum_link($paged - 1)."'>&lsaquo; Previous</a>";
 
         for ($i=1; $i <= $pages; $i++)
         {
             if (1 != $pages &&( !($i >= $paged+$range+1 || $i <= $paged-$range-1) || $pages <= $showitems ))
             {
                 echo ($paged == $i)? "<span class=\"current\">".$i."</span>":"<a href='".get_pagenum_link($i)."' class=\"inactive\">".$i."</a>";
             }
         }
 
         if ($paged < $pages && $showitems < $pages) echo "<a href=\"".get_pagenum_link($paged + 1)."\">Next &rsaquo;</a>";  
         if ($paged < $pages-1 &&  $paged+$range-1 < $pages && $showitems < $pages) echo "<a href='".get_pagenum_link($pages)."'>Last &raquo;</a>";
         next_posts_link(); 
         echo "</div>\n";
     }
}
function underscore_pets_widgets_init() {
	register_sidebar( array(
		'name'          => esc_html__( 'Sidebar', 'underscore-pets' ),
		'id'            => 'sidebar-1',
		'description'   => '',
		'before_widget' => '<section id="%1$s" class="widget %2$s">',
		'after_widget'  => '</section>',
		'before_title'  => '<h2 class="widget-title">',
		'after_title'   => '</h2>',
	) );
}
add_action( 'widgets_init', 'underscore_pets_widgets_init' );

/**
 * Enqueue scripts and styles.
 */
function underscore_pets_scripts() {
	wp_enqueue_style( 'underscore-pets-style', get_stylesheet_uri() );

	wp_enqueue_script( 'underscore-pets-navigation', get_template_directory_uri() . '/js/navigation.js', array(), '20151215', true );

	wp_enqueue_script( 'underscore-pets-skip-link-focus-fix', get_template_directory_uri() . '/js/skip-link-focus-fix.js', array(), '20151215', true );
	
	wp_enqueue_script('backstretch', get_stylesheet_directory_uri() . '/js/backstretch.js', array('jquery'), '2.0.4', true );

	if ( is_singular() && comments_open() && get_option( 'thread_comments' ) ) {
		wp_enqueue_script( 'comment-reply' );
	}
}
add_action( 'wp_enqueue_scripts', 'underscore_pets_scripts' );

// Call the file that controls the theme options
require get_stylesheet_directory() . '/inc/options.php';

/**
 * Implement the Custom Header feature.
 */
require get_template_directory() . '/inc/custom-header.php';

/**
 * Custom template tags for this theme.
 */
require get_template_directory() . '/inc/template-tags.php';

/**
 * Custom functions that act independently of the theme templates.
 */
require get_template_directory() . '/inc/extras.php';

/**
 * Customizer additions.
 */
require get_template_directory() . '/inc/customizer.php';

/**
 * Load Jetpack compatibility file.
 */
require get_template_directory() . '/inc/jetpack.php';

// Create Slider Post Type
require( get_template_directory() . '/inc/slider/slider_post_type.php' );
// Create Slider
require( get_template_directory() . '/inc/slider/slider.php' );

// Create Slider
 
    function wptuts_slider_template() {
 
        // Query Arguments
        $args = array(
            'post_type' => 'slides',
            'posts_per_page' => 5
        );  
 
        // The Query
        $the_query = new WP_Query( $args );
 
        // Check if the Query returns any posts
        if ( $the_query->have_posts() ) {
 
            // Start the Slider ?>
            <div class="flexslider">
                <ul class="slides">
 
                    <?php
                    // The Loop
                    while ( $the_query->have_posts() ) : $the_query->the_post(); ?>
                        <li>
 
                        <?php // Check if there's a Slide URL given and if so let's a link to it
                        if ( get_post_meta( get_the_id(), 'wptuts_slideurl', true) != '' ) { ?>
                            <a href="<?php echo esc_url( get_post_meta( get_the_id(), 'wptuts_slideurl', true) ); ?>">
                        <?php }
 
                        // The Slide's Image
                        echo the_post_thumbnail();
 
                        // Close off the Slide's Link if there is one
                        if ( get_post_meta( get_the_id(), 'wptuts_slideurl', true) != '' ) { ?>
                            </a>
                        <?php } ?>
 
                        </li>
                    <?php endwhile; ?>
 
                </ul><!-- .slides -->
            </div><!-- .flexslider -->
 
        <?php }
 
        // Reset Post Data
        wp_reset_postdata();
    }