PHP code to get WHOIS information of a domain

whois.php

<?php
/**
 * @author	Luis Cortés
 * [Whois description]
 * @param string $whois  [description]
 * @param [type] $domain [description]
 */
function Whois($whois='', $domain){

	$stringDataWhois="";
	$Show   = array();
	$sock   = fsockopen($whois, 43);

	if(!$sock){
		$Show[0]=false;
	}else{
		$Show[0]=true;
	fwrite($sock, $domain."\r\n");
	while(!feof($sock) ){
		$stringDataWhois .= fgets($sock,128);
	}
	fclose($sock);
		$Show[1]=$stringDataWhois;     
	}
	return $Show;	       
}

$WhoisName = array(
  '.com'   =>array('whois.crsnic.net','No match for'),//.com
  '.net'   =>array('whois.crsnic.net','No match for'),// .net
  '.bo'    =>array('whois.nic.bo','whois.nic.bo solo acepta consultas con dominios .bo'),//.bo
  '.mx'    =>array('whois.nic.mx','No_Se_Encontro_El_Objeto'),//.mx
  '.pe'    =>array('whois.nic.pe','No Object Found'),//.pe
  '.co'    =>array('whois.nic.co','Not found'), //.co
  '.es'    =>array('whois.nic.es','Not found') //.cr
);

$DomainName       = filter_var (empty($_POST['name']) ? false :  $_POST['name'], FILTER_SANITIZE_STRING);
$DomainExtension  = filter_var (empty($_POST['Ext'])  ? false :  $_POST['Ext'], FILTER_SANITIZE_STRING);
$increase         = filter_var (empty($_POST['increase']) ? 0 :  $_POST['increase'], FILTER_SANITIZE_NUMBER_INT);

if(strlen($DomainName)>0){
	$stringParser="";
	$DomainName   = preg_replace(
		array(
			'/www./',
			'/http:\//',
			'/\//',
			'/.com/',
			'/.bo/',
			'/.com.bo/',
			'/edu.bo/',
			'/.org.bo/',
			'/.net/',
			'/.mx/',
			'/.pe/',
			'/.co/'
		),
		'',
		$DomainName
	);

   	foreach ($WhoisName as $key => $value) {
   		if($key==$DomainExtension){
			if (Whois($value[0],$DomainName.$DomainExtension)[0]==true){
				$DataWhois= Whois($value[0],$DomainName.$DomainExtension)[1];
				$Available = '<div class="alert alert-success alert-dismissible" style="width: 100%;" role="alert">
				<button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button><span>Yes! Your domain <strong>'.$DomainName.$DomainExtension.'</strong> is available. Buy it before someone else does. </span><button class="btn btn-success ml-3" id="Enviar" type="button"><i class="im im-icon-Full-Cart"></i> Buy this domain</button></div>';
				$NotAvailable = '<div class="alert alert-light alert-dismissible" role="alert"><button type="button" class="close" data-dismiss="alert" aria-label="Close"><span aria-hidden="true">&times;</span></button><span>Sorry, <strong>'.$DomainName.$DomainExtension.'</strong> is taken.</span><a class="btn btn-danger ml-3" role="button" data-toggle="collapse" href="#collapseExample'.$increase .'" aria-expanded="false" aria-controls="collapseExample'.$increase .'"> View domain information</a><div class="collapsing" id="collapseExample'.$increase .'"><div class="card mt-4 p-3"><pre>'.Whois($value[0],$DomainName.$DomainExtension)[1].'</pre></div></div></div>';
				// We remove some characters
				// of the Bolivian WHOIS server
				if($key==".bo"){
					$DataWhois=str_replace(array("\r\n", "\n", "\r"), '',$DataWhois);
					if($DataWhois==$value[1]){
						echo $Available;
					}else{
						echo $NotAvailable;
					}
				}else{
					//searching...
					if (preg_match("/".$value[1]."/i",$DataWhois)){
						echo $Available ;
					}else{
						echo $NotAvailable;
					}
				}
			}else{
			}
   		}
   	}
 }
 ?>