<?php
$str = "<span class='altBilling billingByAddress'>Invoices for this address go to a different recipient</span>";
echo str_str($str,"billingByAddress");
Fatal error: Uncaught Error: Call to undefined function str_str() in /in/Ph0gp:4
Stack trace:
#0 {main}
thrown in /in/Ph0gp on line 4
Process exited with code 255.