CODE EXAMPLE FOR PHP

how to validate phone number in php procedural programming

<?php
$reg = '/^[_a-z0-9-]+(.[_a-z0-9-]+)*@[a-z0-9-]+(.[a-z0-9-]+)*(.[a-z]{2,3})$/';
if (preg_match($reg, $email)) {
echo $email . " Email Id is accepted.";
} else {
echo $email . "Invalid Email ID.";
}
?>