원격지 파일의 존재 여부를 체크 사용자 함수

<?php
/**
* @description  : 원격 파일 체크
* @param        :  url (http://domain.com/file.gif)
*/

function remote_file_exist($url)
{
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL,$url);
        // don't download content
        curl_setopt($ch, CURLOPT_NOBODY, 1);
        curl_setopt($ch, CURLOPT_FAILONERROR, 1);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        if(curl_exec($ch)!==FALSE)
        {
            return TRUE;
        }
        else
        {
            return FALSE;
        }
}

// or

function url_exists($url)
{
    if(@file_get_contents($url,0,NULL,0,1))
    {
        return 1;
    }
    else
    {
        return 0;
     }
}

?>


예제)
<?php

if( remote_file_exist('http://xespresso.net/filies/text.txt') == true )
{
echo '파일이 존재 합니다.';
}
else
{
echo '파일이 존재하지 않습니다.';
}

?>

원격 이미지 파일 존재여부 체크
<?php

    $external_link = 'http://www.xespresso.com/example.jpg';

    if (@GetImageSize($external_link)) {

        echo "image exists";

    } else {

        echo "image does not exist";

    }

?>

URL 존재 여부 체크
<?php

function url_exists($url)
{
    if(strstr($url, "http://")) $url = str_replace("http://", "", $url);
    $fp = @fsockopen($url, 80);
    if($fp === false) return false;
  return true;

}

// or

function url_exists($url)
{

    if ((strpos($url, "http")) === false) $url = "http://" . $url;
    if (is_array(@get_headers($url)))
        return true;
    else
        return false;

}


// or


function is_valid_url($url)
{

    $url = @parse_url($url);
    if (!$url)
    {
        return false;
    }
    $url = array_map('trim', $url);
    $url['port'] = (!isset($url['port'])) ? 80 : (int)$url['port'];
    $path = (isset($url['path'])) ? $url['path'] : '';
    if ($path == '')
    {
        $path = '/';
    }
    $path .= (isset($url['query'])) ? "?$url[query]" : '';
    if (isset($url['host']) AND $url['host'] != gethostbyname($url['host']))
    {
        if (PHP_VERSION >= 5)
        {
           $headers = get_headers("$url[scheme]://$url[host]:$url[port]$path");
        }
        else
        {
            $fp = fsockopen($url['host'], $url['port'], $errno, $errstr, 30);
            if (!$fp)
            {
            return false;
            }
            fputs($fp, "HEAD $path HTTP/1.1\r\nHost: $url[host]\r\n\r\n");
            $headers = fread($fp, 4096);
            fclose($fp);
        }
        $headers = (is_array($headers)) ? implode("\n", $headers) : $headers;
        return (bool)preg_match('#^HTTP/.*\s+[(200|301|302)]+\s#i', $headers);
    }
    return false;

}

?>

메일 존재 여부 체크
<?php



if(!function_exists('checkdnsrr'))

function checkdnsrr($hostName, $recType = '')
{

if(!empty($hostName)) {
   if( $recType == '' ) $recType = "MX";
   exec("nslookup -type=$recType $hostName", $result);
   // check each line to find the one that starts with the host
   // name. If it exists then the function succeeded.
   foreach ($result as $line) {
     if(eregi("^$hostName",$line)) {
       return true;
     }
   }
   // otherwise there was no mail handler for the domain
   return false;
}
return false;

}


function email_exist($email) {

    list($userid, $domain) = split("@", $email);
    if (checkdnsrr($domain, "MX")) { return true;} else { return false;}

}

// or

function check_email($email)
{

    $email_error = false;
    $Email = htmlspecialchars(stripslashes(strip_tags(trim($email)))); //parse unnecessary characters to prevent exploits
    if ($Email == "") { email_error = true; }
    elseif (!eregi("^([a-zA-Z0-9._-])+@([a-zA-Z0-9._-])+\.([a-zA-Z0-9._-])([a-zA-Z0-9._-])+", $Email)) { email_error = true; }

    else {
    list($Email, $domain) = split("@", $Email, 2);
        if (! checkdnsrr($domain, "MX")) { email_error = true; }
        else {
        $array = array($Email, $domain);
        $Email = implode("@", $array);
        }
    }
    if (email_error) { return false; } else{return true;}

}

// or

function check_email($email)
{

    $email_error = false;
    $Email = htmlspecialchars(stripslashes(strip_tags(trim($email)))); //parse unnecessary characters to prevent exploits
    if ($Email == "") { email_error = true; }
    elseif (!eregi("^([a-zA-Z0-9._-])+@([a-zA-Z0-9._-])+\.([a-zA-Z0-9._-])([a-zA-Z0-9._-])+", $Email)) { email_error = true; }
    else {
    list($Email, $domain) = split("@", $Email, 2);
        if (! checkdnsrr($domain, "MX")) { email_error = true; }
        else {
        $array = array($Email, $domain);
        $Email = implode("@", $array);
        }
    }
    if (email_error) { return false; } else{return true;}

}


?>