How to get wordpress site title name from url ?

get wordpress site title name from url 

<?php

// Exit if accessed directly
if ( !defined( 'ABSPATH' ) ) exit;


function oops_script(){

wp_enqueue_style("oops-style", plugin_dir_url(__FILE__)."style.css");

}
add_action("wp_enqueue_scripts","oops_script");



/*+++++++ Declaring Global Variables +++++++++*/
$domain = site_url(); //or home
$domain = str_replace('http://', '', $domain);
$domain = str_replace('www', '', $domain);
$domain = str_replace('.com', '', $domain);
$domain = str_replace('/', '', $domain);
$domain = str_replace('localhost', '', $domain);

 $wpsite = $domain;


?>

use it in another page with global variable

<?php



global $wpsite;

echo $wpsite ;



?>