Função:

function SomarData($data, $dias, $meses, $ano)
{
  //passe a data no formato dd/mm/yyyy
   $data = explode(“/”, $data);
   $newData = date(“d/m/Y”, mktime(0, 0, 0, $data[1] + $meses,
  $data[0] + $dias, $data[2] + $ano) );
   return $newData;
}

Exemplo de como usar:
echo SomarData(“04/04/2007″, 1, 2, 1);

Este exemplo acima estamos adicionando 1 dia, 2 meses e 1 ano na data informada. O resultado então seria “05/06/2008″

• Checa a variavel enviada pelo metodo POST.
• Checa a variavel enviada pelo metodo GET.
• Retorna nome do arquivo da página atual.
• Verifica se existe sessão e retorna nome do arquivo da página atual com SID(Id da Sessão) se a sessão existir.

Para download functionsincphp.txt

  <?php

/*
* Script written by Danltn
* Leave this message intact for use, visitors won’t see it, don’t worry
* URL: http://danltn.com
*/

function site($site, $url)
{
// This function turns the provided parameters into a link.
$link = ‘<a href=”‘. $url . ‘”>’ . $site . ‘</a>’;
return $link;
}
// Set your websites here, remember to increase the number by one each time.

$website[1] = site(“Google”,”http://google.com”);
$website[2] = site(“MSN”,”http://msn.com”);
$website[3] = site(“Yahoo”,”http://yahoo.com”);
$website[4] = site(“Ask”,”http://ask.com”);
$website[5] = site(“Ebay”,”http://ebay.com”);

$before = “”; // What should go before each link, you could for example use it as a <li> element. I’ve set it to nothing.
$after = “<br />”; // What should go after, it could be </li> or <br /> for example. I’ve set it to line break.

$show = 3; // Set the amount of websites to list here

// PHP Magic
$show = floor($show);
if ($show != 1) {
if ($show > count($website)) { $show = count($website); }
$r = array_rand($website, $show);
for ($k=0; $k < $show; $k++)
{
echo $before . $website[$r[$k]] . $after;
} } elseif ($show = 1) { $rand = rand(1, count($website)); echo $website[$rand]; }
?>

<?php
//1. $site must start with http://
//2. $tags must be separated with spaces, not commas
//3. $proxy_addy must start with http://
//4. $use_proxy must be passed in as TRUE if you want to use a proxy
//5. Make sure you have CURL installed.

function delicious_submit($user, $pass, $site, $note, $desc, $tags, $proxy_addy, $proxy_port, $use_proxy = FALSE)
{
// Set curl options.
$user_agent = “Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)”;
$ch = curl_init();
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, CURLOPT_USERAGENT, $user_agent);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_COOKIEJAR, dirname(__FILE__).’/cookie.txt’);
curl_setopt($ch, CURLOPT_COOKIEFILE, dirname(__FILE__).’/cookie.txt’);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
if($use_proxy){
curl_setopt($ch, CURLOPT_HTTPPROXYTUNNEL, 1);
curl_setopt($ch, CURLOPT_PROXY, $proxy_addy);
curl_setopt($ch, CURLOPT_PROXYPORT, $proxy_port);
}

// Visit login page.
$url = ‘https://secure.del.icio.us/login’;
$params = ”;
curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
curl_setopt($ch, CURLOPT_URL, $url);
$result = curl_exec($ch);

//Grab unique token.
$piece = strstr($result, “inkey\”");
$piece = strstr($piece, “value=\”");
$token = substr($piece, 7, 32);

// Log in with token, user and pass.
$url = ‘https://secure.del.icio.us/login’;
$params = ‘inkey=’ . $token . ‘&user_name=’ . $user . ‘&password=’ . $pass . ‘&login=log%20in’;
curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
curl_setopt($ch, CURLOPT_URL, $url);
$result = curl_exec($ch);

// Submit the url.
$url = ‘http://del.icio.us/’ . $user . ‘?url=’ . $site . ‘&submit=save&jump=no’;
curl_setopt($ch, CURLOPT_HTTPGET, 1);
curl_setopt($ch, CURLOPT_URL, $url);
$result = curl_exec($ch);

// Grab the new token.
$piece = strstr($result, “key\”");
$piece = strstr($piece, “value=\”");
$token = substr($piece, 7, 32);

// Grab the unique key code.
$piece = strstr($result, $user . “?”);
$piece = substr($piece, strlen($user));
$piece = strstr($piece, $user . “?”);
$quote = strpos($piece, “\”");
$len = strlen($user);
$code = substr($piece, $len + 1, $quote – $len – 1);

// Submit the url, description, notes, and tags along with the new token and key code.
$url = ‘http://del.icio.us/’ . $user . ‘?’ . $code;
$params = ‘url=’ . $site . ‘&oldurl=’ . $site . ‘&description=’ . $desc . ‘&notes=’ . $note . ‘&tags=’ . $tags . ‘&jump=no&key=’ . $token;
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $params);
curl_setopt($ch, CURL_OPT_URL, $url);
$result = curl_exec($ch);

curl_close($ch);
}
?>

Para verificar o domínio temos a seguinte função

function VerifyEmailAddress($EMail){
list($User, $Domain) = explode(“@”, $EMail);
$Result = checkdnsrr($Domain, ‘MX’);
return($Result);
}

Fonte: bytemycode