[PHP] Get Gravatar Image from user email

GravatarMethod.php

<?php
/**
 * Generate Gravatar image for user
 * @param  string
 * @return string
 */
public function getImageAttribute($value)
{
    $gravemail = md5(
        strtolower(
            trim($this->email)
        )
    );

    return 'https://www.gravatar.com/avatar/'.$gravemail.'?s=128&d=mm';
}