- trim: documentation ( source)
- strtolower: documentation ( source)
- printf: documentation ( source)
- md5: documentation ( source)
<?php
$email = "cely@iqnection.com";
$hash = md5( strtolower( trim( $email ) ) );
printf('<img src="http://www.gravatar.com/avatar/%s?d=identicon" />', $hash);