$array = explode("\n", file_get_contents('1.txt'));
foreach($array AS $url)
{
    echo 'Сылка: <a href="'.$url.'">'.$url.'</a>';
    if (check_domain_availible($url))
        echo 'доступен <br>';
    else
        echo 'не доступен <br>';
}

$array = explode("\n", file_get_contents('твой_файл_тхт_в_котором_информация.txt'));

<?php

function check_domain_availible($domain)
  {
  if (!filter_var($domain, FILTER_VALIDATE_URL))
    return false;

  $curlInit = curl_init($domain);
  curl_setopt($curlInit, CURLOPT_CONNECTTIMEOUT, 10);
  curl_setopt($curlInit, CURLOPT_HEADER, true);
  curl_setopt($curlInit, CURLOPT_NOBODY, true);
  curl_setopt($curlInit, CURLOPT_RETURNTRANSFER, true);

  $response = curl_exec($curlInit);
  curl_close($curlInit);

  if ($response)
    return true;
  return false;


}

$array = explode("\n", file_get_contents('1.txt'));
  

foreach($array AS $url)

{

 echo 'Сылка: <a href="'.$url.'">'.$url.'</a>';
if (check_domain_availible($url))
  echo ' доступен <BR>';
else
  echo ' не доступен <BR>';
  
   
}

?>

<?php
set_time_limit(0);
// уменьшаем таймаут сокета до 3 секунд
stream_context_set_default(array('http' => array('timeout' => 3)));
$urls = array_map('trim', file('1.txt'));
foreach($urls as $url)
    echo $url.(($header = @get_headers($url)) && strpos($header[0], '200') ? ' Доступен' : ' Не доступен').'<br />'; 
?>

set_time_limit(0);
stream_context_set_default(
		array(
			'http' => array(
				'timeout' => 3, 
				'method' => 'HEAD', 
				'header' => 'User-Agent:Opera/9.80 (Windows NT 6.1; WOW64; U; '.
				'Edition Ukraine Local; ru) Presto/2.10.229 Version'.
				'/11.62'
				)
			)
);
$urls = array_map('trim', file('1.txt'));
foreach($urls as $url){
	$check = false;
	if($headers = @get_headers($url)){
		foreach ($headers as $header){
			if(preg_match('#^HTTP/\d\.\d\s+2\d\d#', $header)){
				$check = true;
				break;
			}
		}
	}
	echo $url.($check ? ' Доступен' : ' Не доступен').'<br />';
}

stream_context_set_default(
		array(
			'http' => array(
				'timeout' => 3, 
				'method' => 'HEAD', 
				'header' => 'User-Agent:Opera/9.80 (Windows NT 6.1; WOW64; U; '.
				'Edition Ukraine Local; ru) Presto/2.10.229 Version'.
				'/11.62'
				)
			)
);

error_reporting(E_ALL);

set_time_limit(0); 
$context = stream_context_create( 
        array( 
            'http' => array( 
                'timeout' => 3,  
                'method' => 'HEAD',  
                'header' => 'User-Agent:Opera/9.80 (Windows NT 6.1; WOW64; U; '. 
                'Edition Ukraine Local; ru) Presto/2.10.229 Version'. 
                '/11.62' 
                ) 
            ) 
); 
$urls = array_map('trim', file('1.txt')); 

foreach($urls as $url){ 
    $check = false; 
    @file_get_contents($url, false, $context); 
    if(!empty($http_response_header)){ 
        foreach ($http_response_header as $header){ 
            if(preg_match('#^HTTP/\d\.\d\s+2\d\d#', $header)){ 
                $check = true; 
                break; 
            } 
        } 
         
    } 
    unset($http_response_header); 
    echo $url.($check ? ' Доступен' : ' Не доступен').'<br />'; 
}