Compare Two Domain Name Values

functions.php

<?php

/**
 * Compare Two Domain Name Values
 *
 * @author Edwin Velez (https://edwinvelez.net)
 * @link https://edwinvelez.net/compare-two-domain-name-values/
 */

// The domain name or host you want to compare. Can also be a host i.e. http://localhost
$live_site_url = 'https://edwinvelez.net';

$head_pattern         = '/(https?:\/\/(w{3}\.)?)?(^w{3}\.)?';
$tail_pattern         = '(\:[0-9]+).*|\b\/.*|\b\?.*';
$head_vs_tail_boolean = '|';
$regex_flags          = '/m';
$regex_pattern        = $head_pattern . $head_vs_tail_boolean . $tail_pattern . $regex_flags;

// Strip everything before and after actual domain name and hostname.
$live_site_url = preg_replace( $regex_pattern, '', strtolower( $live_site_url ) );
$site_url      = preg_replace( $regex_pattern, '', strtolower( get_site_url() ) );
$is_live_site  = strcmp( $site_url, $live_site_url );

// Is the web browser pointing to the live site?
if ( $is_live_site === 0 ) {
	// Insert code here to run if this is your live site.
} else {
	// Insert code here to run if this is not your live site.
}

test-samples.txt

http://edwinvelez.net
http://edwinvelez.net/

https://edwinvelez.net
https://edwinvelez.net/

edwinvelez.net
www.edwinvelez.net

edwinvelez.net/testing/another?sdf=123
www.edwinvelez.net/testing/another?sdf=123

edwinvelez.net:3000/testing/another?sdf=123
www.edwinvelez.net:3000/testing/another?sdf=123

www.edwinvelez.net:3000?sdf=123

http://edwin-velez.net
https://edwin-velez.net

http://edwinvelez.net/testing/another?sdf=123
https://edwinvelez.net/testing/another?sdf=123

http://edwinvelez.net:3000/testing/another?sdf=123
https://edwinvelez.net:3000/testing/another?sdf=123

http://edwinvelez.net:3000?sdf=123
https://edwinvelez.net:3000?sdf=123

http://edwinvelez.net?sdf=123
https://edwinvelez.net?sdf=123

http://localhost
https://localhost

http://www.localhost
https://www.localhost

http://localhost:3000
https://localhost:3000
https://localhost:3000/

http://www.localhost:3000/testing/another?sdf=123
https://www.localhost:3000/testing/another?sdf=123

http://www.localhost:3000?sdf=123
https://www.localhost:3000?sdf=123

http://www.localhost.me.you:3000/testing/another?sdf=123
https://www.localhost.me.you:3000?sdf=123

http://www.localhost.me.you:3000
https://www.localhost.me.you:3000

http://www.edwinvelez.www.net
https://www.edwinvelez.www.net

http://subdomain.subdomain.www.edwinvelez.net/testing/another?sdf=123
https://subdomain.subdomain.www.edwinvelez.net/testing/another?sdf=123

http://subdomain.subdomain.www.edwinvelez.net:9871/testing/another?sdf=123
https://subdomain.subdomain.www.edwinvelez.net:9871/testing/another?sdf=123