Проверка валидности емайл адреса
Добавлено через 20 минут
В файле-обработчике формы производим следующие действия:
1. Разбиваем введенный адрес на имя пользователя и имя хоста
(для адреса tabyretkin@bla-bla.ru:
tabyretkin - это пользователь
bla-bla.ru - это хост)
2. Далее следует "гвоздь программы" - функция getmxrr(), которая возвращает набор записей MX (Mail Exchange - почтового обмена). MX-запись содержится в DNS.
3. При желании можно выдать список хостов, через которые возможна отправка писем. Этот список находится в массиве $mxhostsarr
PHP:
function emailCheck($emailStr)
{
if($emailStr=='') return '';
// The following is the list of known TLDs that an e-mail address must end with.
$knownDomsPat= '^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$';
/* The following pattern is used to check if the entered e-mail address
fits the user@domain format. It also is used to separate the username
from the domain. */
$emailPat= '/^(.+)@(.+)$/';
/* The following string represents the pattern for matching all special
characters. We don't want to allow special characters in the address.
These characters include ( ) < > @ , ; : \ " . [ ] */
$specialChars= '\\(\\)><@,;\/:\\\\\\\"\\.\\[\\]';
/* The following string represents the range of characters allowed in a
username or domainname. It really states which chars aren't allowed.*/
$validChars= '[^\\s' . $specialChars . ']';
/* The following pattern applies if the "user" is a quoted string (in
which case, there are no rules about which characters are allowed
and which aren't; anything goes). E.g. "jiminy cricket"@disney.com
is a legal e-mail address. */
$quotedUser= '(\"[^\"]*\")';
/* The following pattern applies for domains that are IP addresses,
rather than symbolic names. E.g. joe@[123.124.233.4] is a legal
e-mail address. NOTE: The square brackets are required. */
$ipDomainPat= '/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/';
/* The following string represents an atom (basically a series of non-special characters.) */
$atom= $validChars . '+';
/* The following string represents one word in the typical username.
For example, in [email]john.doe@somewhere.com[/email], john and doe are words.
Basically, a word is either an atom or quoted string. */
$word= '(' . $atom . '|' . $quotedUser . ')';
// The following pattern describes the structure of the user
$userPat= '/^' . $word . '(\\.' . $word . ')*$/';
/* The following pattern describes the structure of a normal symbolic
domain, as opposed to ipDomainPat, shown above. */
$domainPat= '/^' . $atom . '(\\.' . $atom . ')*$/';
/* Finally, let's start trying to figure out if the supplied address is valid. */
/* Begin with the coarse pattern to simply break up user@domain into
different pieces that are easy to analyze. */
if (!preg_match($emailPat,$emailStr,$matchArray))
{
/* Too many/few @'s or something; basically, this address doesn't
even fit the general mould of a valid e-mail address. */
return 'Email address seems incorrect (check @ and .)';
}
$user=$matchArray[1];
$domain=$matchArray[2];
// Start by checking that only basic ASCII characters are in the strings (0-127).
for ($i=0; $i<strlen($user); $i++)
if (ord(substr($user,$i,1))>127) return 'The username in email contains invalid characters.';
for ($i=0; $i<strlen($domain); $i++)
if (ord(substr($domain,$i,1))>127) return 'This domain name contains invalid characters.';
// user is not valid
if (!preg_match($userPat,$user)) return 'The username in email does not seem to be valid.';
/* if the e-mail address is at an IP address (closed in [] ) make sure the IP address is valid. */
if (preg_match($ipDomainPat,$domain,$IPArray))
{
for ($i=1;$i<=4;$i++)
if ($IPArray[$i]>255 OR $IPArray[$i]=='') return 'Destination IP address is invalid!';
return '';
}
// Domain is symbolic name. Check if it's valid.
$atomPat= '/^' . $atom . '$/';
$domArr=split('\.',$domain);
$len=count($domArr);
for ($i=0;$i<$len;$i++)
if (!preg_match($atomPat,$domArr[$i])) return 'The domain name does not seem to be valid.';
/* domain name seems valid, but now make sure that it ends in a
known top-level domain (like com, edu, gov) or a two-letter word,
representing country (uk, nl), and that there's a hostname preceding
the domain or country. */
if (strlen($domArr[count($domArr)-1])!=2 && !ereg($knownDomsPat,$domArr[count($domArr)-1]))
return 'The email address must end in a well-known domain or two letter country, or IP closed in [].';
// Make sure there's a host name preceding the domain.
if ($len<2) return 'This email address is missing a hostname!';
// If we've gotten this far, everything's valid!
return '';
}Добавлено через 20 минут
В файле-обработчике формы производим следующие действия:
1. Разбиваем введенный адрес на имя пользователя и имя хоста
(для адреса tabyretkin@bla-bla.ru:
tabyretkin - это пользователь
bla-bla.ru - это хост)
PHP:
$email_arr = explode("@" , $email);
$emailhost = $email_arr[1];2. Далее следует "гвоздь программы" - функция getmxrr(), которая возвращает набор записей MX (Mail Exchange - почтового обмена). MX-запись содержится в DNS.
PHP:
if (!getmxrr($emailhost, $mxhostsarr))
{
echo "На адрес $email нельзя отправить почту!";
exit;
}3. При желании можно выдать список хостов, через которые возможна отправка писем. Этот список находится в массиве $mxhostsarr
PHP:
echo "На $email возможна отправка писем через следующие хосты: ";
for ($i=0; $i < count($mxhostsarr); $i++)
echo $mxhostsarr[$i]." ";
![:-]](/styles/default/nulled/smilies/1.gif "Ухмылка :-]")