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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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