CakePHP-GravatarHelper

GravatarHelper.php

<?php

class GravatarHelper extends AppHelper {
    
    /**
    * Get either a Gravatar URL or complete image tag for a specified email address.
    *
    * @param string $email The email address
    * @param string $s Size in pixels, defaults to 80px [ 1 - 2048 ]
    * @param boole $img True to return a complete IMG tag False for just the URL
    * @param array $atts Optional, additional key/value attributes to include in the IMG tag
    * @return String containing either just a URL or a complete image tag
    * @source http://gravatar.com/site/implement/images/php/
    */
    public function image( $email, $s = 80, $img = false, $atts = array() ) {
        $d = 'mm'; //Default imageset to use [ 404 | mm | identicon | monsterid | wavatar ]
        $r = 'g'; //Maximum rating (inclusive) [ g | pg | r | x ]
        $url = 'http://www.gravatar.com/avatar/';
        $url .= md5( strtolower( trim( $email ) ) );
        $url .= "?s=$s&d=$d&r=$r";
        if ( $img ) {
            $url = '<img src="' . $url . '"';
            foreach ( $atts as $key => $val )
                $url .= ' ' . $key . '="' . $val . '"';
            $url .= ' />';
        }
        return $url;
    }
}

Usage

Just put GravatarHelper.php file in your app/View/Helper folder, and add below code in your view.
echo $this->Gravatar->image($email = 'foo@anydomain.com', $size=200, $image_tag = TRUE, array('alt' => '...', 'title' => '...', 'class' => 'some-image-class' ));