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How to select domain name from email address using substr() function in php

Below code for extract domain name from an email address using substr() function

<?php 
$my_email='contact@mydoubts.com';
$result=substr($my_email,strpos($my_email,'@')+1);
echo $result;
?>

<?php

$my_email='contact@mydoubts.com';

$result=substr($my_email,strpos($my_email,'@')+1);

echo $result;