<?php

function filter_var_email($value) {
  //@see http://php.net/manual/en/function.filter-var.php
  //@see http://svn.php.net/viewvc/php/php-src/trunk/ext/filter/logical_filters.c?view=co&content-type=text%2Fplain
  return filter_var($value, FILTER_VALIDATE_EMAIL);
}