- var_dump: documentation ( source)
- filter_var: documentation ( source)
- wordwrap: documentation ( source)
<?php
$email = "0123456789012345678901234567890123456789012345678901234567890123456789@b.com";
$wrapped = wordwrap($email, 70);
$checked = filter_var($wrapped, FILTER_VALIDATE_EMAIL);
var_dump($email, $wrapped, $checked);