Linux, Apache, MySQL, PHP

return preg_match('/^(?:[\w\!\#\$\%\&\'\*\+\-\/\=\?\^\`\{\|\}\~]+\.)*[\w\!\#\$\%\&\'\*\+\-\/\=\?\^\`\{\|\}\~]+@(?:(?:(?:[a-zA-Z0-9_](?:[a-zA-Z0-9_\-](?!\.)){0,61}[a-zA-Z0-9_-]?\.)+[a-zA-Z0-9_](?:[a-zA-Z0-9_\-](?!$)){0,61}[a-zA-Z0-9_]?)|(?:\[(?:(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])\.){3}(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])\]))$/', $address);

function safe( $name ) {return( str_ireplace(array( "\r", "\n", "%0a", "%0d", "Content-Type:", "bcc:","to:","cc:" ), "", $name ) );}

=((<CR>|<LF>|0x0A/%0A|0x0D/%0D|\\n|\\r)\S).*=i

// Functions found from various sources

// www.nyphp.org/phundamentals/8_Preventing-Email-Header-Injection
// Pattern for filtering email addresses       --  '/^[^@\s]+@([-a-z0-9]+\.)+[a-z]{2,}$/i'
// Pattern for filtering fields such as names  --  '/^[a-z0-9()\/\'":\*+|,.; \- !?&#$@]{2,75}$/i'
function safe( $name ) {return( str_ireplace(array( "\r", "\n", "%0a", "%0d", "Content-Type:", "bcc:","to:","cc:" ), "", $name ) );}

// www.dreamincode.net/forums/topic/228389-preventing-php-mail-header-injections/
$reply_to = filter_var($reply_to, FILTER_VALIDATE_EMAIL);  if(!$reply_to) {...}
function sanitize(&$array) { foreach($array as &$data) $data = str_replace(array("\r", "\n", "%0a", "%0d"), '', stripslashes($data)); } } 


// PHP Mailer
// code.google.com/a/apache-extras.org/p/phpmailer/source/browse/trunk/class.phpmailer.php
// interesting to note that only FILTER_VALIDATE_EMAIL is used, FILTER_SANITIZE_EMAIL is not used
if (function_exists('filter_var')) { //Introduced in PHP 5.2
    if(filter_var($address, FILTER_VALIDATE_EMAIL) === FALSE) {
        return false;
    } else {
        return true;
    }
} else { 
    return preg_match('/^(?:[\w\!\#\$\%\&\'\*\+\-\/\=\?\^\`\{\|\}\~]+\.)*[\w\!\#\$\%\&\'\*\+\-\/\=\?\^\`\{\|\}\~]+@(?:(?:(?:[a-zA-Z0-9_](?:[a-zA-Z0-9_\-](?!\.)){0,61}[a-zA-Z0-9_-]?\.)+[a-zA-Z0-9_](?:[a-zA-Z0-9_\-](?!$)){0,61}[a-zA-Z0-9_]?)|(?:\[(?:(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])\.){3}(?:[01]?\d{1,2}|2[0-4]\d|25[0-5])\]))$/', $address);
}
public function SecureHeader($str) { return trim(str_replace(array("\r", "\n"), '', $str)); } 


// PEAR Mail
function _sanitizeHeaders(&$headers)
{
    foreach ($headers as $key => $value) {
         $headers[$key] = preg_replace('=((<CR>|<LF>|0x0A/%0A|0x0D/%0D|\\n|\\r)\S).*=i', null, $value);
    }
}

try {

   $dbh = new PDO(' ….. ');
	
  	$stmt = $dbh->prepare('INSERT into customer (name) values (:name)');
   $stmt->bindParam(':name', 'lilly');
	$stmt->execute();
   
   $dbh = null;
	
} catch (PDOException $e) {
   print "Error!: " . $e->getMessage() . "<br/>";
   die();
}

include_once "Mail.php";

function isMailSent($from, $to, $subject, $body) {

$host = "mail.domain.com";
$username = "email@domain.com";
$password = "password";

$headers = array ('From' => $from,
'To' => $to,
'Subject' => $subject);

$smtp = Mail::factory('smtp',
array ('host' => $host,
'auth' => true,
'username' => $username,
'password' => $password));
try {

// add to the body
$body = '<p><img src="/images/logo.png" /></p>' . $body . '<p>Thank you!</p>';

// dispathc mail
$mail = $smtp->send($to, $headers, $body);

// check if mail was sent successfully
if (PEAR::isError($mail)) {
return "<p>" . $mail->getMessage() . "</p>";
} else {
return "<p>Message successfully sent!</p>";
}

} catch (Exception $e) {
return $e->getMessage();
}
}