The most used WordPress core functions in one global var for easier sitewide usage.

wp-global-var.php

<?php
/**
 * Global variables
 *
 * The most used WordPress core functions 
 * in one global var for easier sitewide usage.
 * 
 * @return array  Returns array
 */
function zzap_global_site() {

	$site = array(
		// domain/site related
		'home'        => esc_url( home_url( '/' ) ),
		'name'        => get_bloginfo( 'name' ),
		'description' => get_bloginfo( 'description' ),
		'language'    => get_bloginfo( 'language' ),
		'wpurl'       => get_bloginfo( 'wpurl' ),
		'url'         => get_bloginfo( 'url' ),
		'rss_url'     => get_bloginfo( 'rss_url' ),
		'rss2_url'    => get_bloginfo( 'rss2_url' ),

		// settings related
		'blog'           => get_option( 'page_for_posts', true ),
		'posts_per_page' => get_option( 'posts_per_page' ),
		'upload_dir'     => wp_upload_dir(),

		// template related
		'theme_name'   => function_exists( 'wp_get_theme' ) ? wp_get_theme() : get_current_theme(),
		'theme_dir'    => get_template_directory_uri(),
		'template_url' => get_bloginfo( 'template_url' ),

		// child theme related
		'child_dir'      => get_stylesheet_directory_uri(),
		'stylesheet_url' => get_bloginfo( 'stylesheet_url' ),
		'stylesheet_dir' => get_bloginfo( 'stylesheet_directory' ),

		// dashboard/administration related
		'admin'         => admin_url(),
		'admin_email'   => get_bloginfo( 'admin_email' ),
		'admin_profile' => admin_url( 'profile.php' ),

		// other
		'version' => get_bloginfo( 'version' ),
	);
	// if child theme needs filtering
	return apply_filters( 'zzap_global_site_filter', $site );
}
/**
 * Declare global
 * @var array
 */
$globalSite = zzap_global_site();
global $globalSite;