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Filename : Validator.php
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<?php namespace EmailValidator;

/**
 * EmailValidator
 *
 * @package    EmailValidator
 * @copyright  Copyright (c) 2014 James Jackson
 * @license    The MIT License (MIT)
 */
class Validator
{
    /**
     * An array of disposable email domains. Populated when required.
     *
     * @var mixed
     * @access private
     */
    private $disposable = null;

    /**
     * An array of role email users. Populated when required.
     *
     * @var mixed
     * @access private
     */
    private $role = null;

    /**
     * An array of example TLDs.
     * As defined in http://tools.ietf.org/html/rfc2606
     *
     * @var array
     * @access private
     */
    private $exampleTlds = [
        '.test',
        '.example',
        '.invalid',
        '.localhost',
    ];

    /**
     * An array of example domains.
     * As defined in http://tools.ietf.org/html/rfc2606
     *
     * @var array
     * @access private
     */
    private $exampleDomains = [
        'example.com',
        'example.net',
        'example.org',
    ];

    /**
     * Validate an email address using ALL the functions of this library.
     *
     * @param string $email Address
     * @return boolean
     */
    public function isValid($email)
    {
        // Does it look like an email address?
        if (! $this->isEmail($email)) {
            return false;
        }

        // Is is an example domain?
        if ($this->isExample($email)) {
            return false;
        }

        // Is is a it disposable?
        if ($this->isDisposable($email)) {
            return false;
        }

        // Is it role based?
        if ($this->isRole($email)) {
            return false;
        }

        // Does it have an MX record?
        if (! $this->hasMx($email)) {
            return false;
        }

        return true;
    }

    /**
     * Validate an email address using isEmail, isExample and hasMx.
     *
     * @param string $email Address
     * @return boolean
     */
    public function isSendable($email)
    {
        // Does it look like an email address?
        if (! $this->isEmail($email)) {
            return false;
        }

        // Is is an example domain?
        if ($this->isExample($email)) {
            return false;
        }

        // Does it have an MX record?
        if (! $this->hasMx($email)) {
            return false;
        }

        return true;
    }

    /**
     * Valid email
     * Due complexity of email validation (non-latin chars, ", ...), this is VERY simple.
     *
     * Rule: ANYTHING@ANYTHING.ANYTHING
     * Note: webmaster@localhost won't be valid
     *
     * @param string $email Address
     * @return boolean
     */
    public function isEmail($email)
    {
        if (is_string($email)) {
            return (bool) preg_match('/^.+@.+\..+$/i', $email);
        }

        return false;
    }

    /**
     * Detected example email addresses.
     * As defined in http://tools.ietf.org/html/rfc2606
     *
     * @param string $email Address
     * @return boolean|null
     */
    public function isExample($email)
    {
        if (! $this->isEmail($email)) {
            return null;
        }

        $hostname = $this->hostnameFromEmail($email);

        if ($hostname) {
            if (in_array($hostname, $this->exampleDomains)) {
                return true;
            }

            foreach ($this->exampleTlds as $tld) {
                $length = strlen($tld);
                $subStr = substr($hostname, -$length);

                if ($subStr == $tld) {
                    return true;
                }
            }

            return false;
        }

        return null;
    }

    /**
     * Detected disposable email domains
     *
     * @param string $email Address
     * @return boolean|null
     */
    public function isDisposable($email)
    {
        if (! $this->isEmail($email)) {
            return null;
        }

        $hostname = $this->hostnameFromEmail($email);

        if ($hostname) {
            // Load disposable domains
            if (is_null($this->disposable)) {
                $data = new \EmailData\Data();
                $file = $data->getPathToDataFile('php');
                $this->disposable = include($file);
            }

            // Search array for hostname
            if (in_array($hostname, $this->disposable)) {
                return true;
            }

            return false;
        }

        return null;
    }

    /**
     * Detected role based email addresses
     *
     * @param string $email Address
     * @return boolean|null
     */
    public function isRole($email)
    {
        if (! $this->isEmail($email)) {
            return null;
        }

        $user = $this->userFromEmail($email);

        if ($user) {
            // Load disposable domains
            if (is_null($this->role)) {
                $this->role = include('data/role.php');
            }

            // Search array for hostname
            if (in_array($user, $this->role)) {
                return true;
            }

            return false;
        }

        return null;
    }

    /**
     * Test email address for MX records
     *
     * @param string $email Address
     * @return boolean|null
     */
    public function hasMx($email)
    {
        if (! $this->isEmail($email)) {
            return null;
        }

        $hostname = $this->hostnameFromEmail($email);

        if ($hostname) {
            return checkdnsrr($hostname, 'MX');
        }

        return null;
    }


    // Private Functions

    /**
     * Get the user form an email address
     *
     * @access private
     * @param string $email Address
     * @return string|null
     */
    private function userFromEmail($email)
    {
        $parts = explode('@', $email);

        if (count($parts) == 2) {
            return strtolower($parts[0]);
        }

        return null;
    }

    /**
     * Get the hostname form an email address
     *
     * @access private
     * @param string $email Address
     * @return string|null
     */
    private function hostnameFromEmail($email)
    {
        $parts = explode('@', $email);

        if (count($parts) == 2) {
            return strtolower($parts[1]);
        }

        return null;
    }
}