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<?php
/**
* Class EmailAddressValidator
*
* @link https://github.com/aziraphale/email-address-validator
* @link http://code.google.com/p/php-email-address-validation/
* @license New BSD license http://www.opensource.org/licenses/bsd-license.php
* @example if (EmailAddressValidator::checkEmailAddress('test@example.org')) {
* @example // Email address is technically valid
* @example }
*/
class EmailAddressValidator
{
/**
* Check email address validity
* @param string $emailAddress Email address to be checked
* @param bool $allowLocal allow local domains
* @return bool Whether email is valid
*/
public static function checkEmailAddress($emailAddress, $allowLocal = false)
{
// If magic quotes is "on", email addresses with quote marks will
// fail validation because of added escape characters. Uncommenting
// the next three lines will allow for this issue.
//if (get_magic_quotes_gpc()) {
// $emailAddress = stripslashes($emailAddress);
//}
// Control characters are not allowed
if (preg_match('/[\x00-\x1F\x7F-\xFF]/', $emailAddress)) {
return false;
}
// Check email length - min 3 (a@a), max 256
if (!self::checkTextLength($emailAddress, 3, 256)) {
return false;
}
// Split it into sections using last instance of "@"
$atSymbol = strrpos($emailAddress, '@');
if ($atSymbol === false) {
// No "@" symbol in email.
return false;
}
$emailAddressParts[0] = substr($emailAddress, 0, $atSymbol);
$emailAddressParts[1] = substr($emailAddress, $atSymbol + 1);
// Count the "@" symbols. Only one is allowed, except where
// contained in quote marks in the local part. Quickest way to
// check this is to remove anything in quotes. We also remove
// characters escaped with backslash, and the backslash
// character.
$tempAddressParts[0] = preg_replace('/\./', '', $emailAddressParts[0]);
$tempAddressParts[0] = preg_replace('/"[^"]+"/', '', $tempAddressParts[0]);
$tempAddressParts[1] = $emailAddressParts[1];
$tempAddress = $tempAddressParts[0] . $tempAddressParts[1];
// Then check - should be no "@" symbols.
if (strrpos($tempAddress, '@') !== false) {
// "@" symbol found
return false;
}
// Check local portion
if (!self::checkLocalPortion($emailAddressParts[0])) {
return false;
}
// Check domain portion
if (!self::checkDomainPortion($emailAddressParts[1], $allowLocal)) {
return false;
}
// If we're still here, all checks above passed. Email is valid.
return true;
}
/**
* Checks email section before "@" symbol for validity
* @param string $localPortion Text to be checked
* @return bool Whether local portion is valid
*/
public static function checkLocalPortion($localPortion)
{
// Local portion can only be from 1 to 64 characters, inclusive.
// Please note that servers are encouraged to accept longer local
// parts than 64 characters.
if (!self::checkTextLength($localPortion, 1, 64)) {
return false;
}
// Local portion must be:
// 1) a dot-atom (strings separated by periods)
// 2) a quoted string
// 3) an obsolete format string (combination of the above)
$localPortionParts = explode('.', $localPortion);
for ($i = 0, $max = sizeof($localPortionParts); $i < $max; $i++) {
if (!preg_match('.^('
. '([A-Za-z0-9!#$%&\'*+/=?^_`{|}~-]'
. '[A-Za-z0-9!#$%&\'*+/=?^_`{|}~-]{0,63})'
.'|'
. '("[^\\\"]{0,62}")'
.')$.'
,$localPortionParts[$i])) {
return false;
}
}
return true;
}
/**
* Checks email section after "@" symbol for validity
* @param string $domainPortion Text to be checked
* @param bool $allowLocal allow local domains?
* @return bool Whether domain portion is valid
*/
public static function checkDomainPortion($domainPortion, $allowLocal = false)
{
// Total domain can only be from 1 to 255 characters, inclusive
if (!self::checkTextLength($domainPortion, 1, 255)) {
return false;
}
// some IPv4/v6 regexps borrowed from Feyd
// see: http://forums.devnetwork.net/viewtopic.php?f=38&t=53479
$dec_octet = '(?:25[0-5]|2[0-4]\d|1\d\d|[1-9]\d|[0-9])';
$hex_digit = '[A-Fa-f0-9]';
$h16 = "{$hex_digit}{1,4}";
$IPv4Address = "$dec_octet\\.$dec_octet\\.$dec_octet\\.$dec_octet";
$ls32 = "(?:$h16:$h16|$IPv4Address)";
$IPv6Address =
"(?:(?:{$IPv4Address})|(?:" .
"(?:$h16:){6}$ls32" .
"|::(?:$h16:){5}$ls32" .
"|(?:$h16)?::(?:$h16:){4}$ls32" .
"|(?:(?:$h16:){0,1}$h16)?::(?:$h16:){3}$ls32" .
"|(?:(?:$h16:){0,2}$h16)?::(?:$h16:){2}$ls32" .
"|(?:(?:$h16:){0,3}$h16)?::(?:$h16:){1}$ls32" .
"|(?:(?:$h16:){0,4}$h16)?::$ls32" .
"|(?:(?:$h16:){0,5}$h16)?::$h16" .
"|(?:(?:$h16:){0,6}$h16)?::" .
")(?:\\/(?:12[0-8]|1[0-1][0-9]|[1-9][0-9]|[0-9]))?)";
if (preg_match("/^($IPv4Address|\\[$IPv4Address\\]|\\[$IPv6Address\\])$/",
$domainPortion)){
return true;
} else {
$domainPortionParts = explode('.', $domainPortion);
if (!$allowLocal && sizeof($domainPortionParts) < 2) {
return false; // Not enough parts to domain
}
for ($i = 0, $max = sizeof($domainPortionParts); $i < $max; $i++) {
// Each portion must be between 1 and 63 characters, inclusive
if (!self::checkTextLength($domainPortionParts[$i], 1, 63)) {
return false;
}
if (!preg_match('/^(([A-Za-z0-9][A-Za-z0-9-]{0,61}[A-Za-z0-9])|'
.'([A-Za-z0-9]+))$/', $domainPortionParts[$i])) {
return false;
}
if ($i == $max - 1) { // TLD cannot be only numbers
if (strlen(preg_replace('/[0-9]/', '', $domainPortionParts[$i])) <= 0) {
return false;
}
}
}
}
return true;
}
/**
* Check given text length is between defined bounds
* @param string $text Text to be checked
* @param int $minimum Minimum acceptable length
* @param int $maximum Maximum acceptable length
* @return bool Whether string is within bounds (inclusive)
*/
protected static function checkTextLength($text, $minimum, $maximum)
{
// Minimum and maximum are both inclusive
$textLength = strlen($text);
return ($textLength >= $minimum && $textLength <= $maximum);
}
}
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