- str_replace: documentation ( source)
<?php
$htm = "Dear User,
Thanks for register in our site.
We will contact you shortly.
Regards,
#COMPANY_NAME#
#SITE_URL#";
$findarray = array("#COMPANY_NAME#","#SITE_URL#");
$replacearray = array($COMPANY_NAME_v,$SITE_URL);
echo $vBody = str_replace($findarray, $replacearray, $htm);