if $ssl == true $this-ssl = true; $relay_host = ssl $relay_host;

This code snippet is checking if the value of the variable $ssl is true. If it is true, it sets the property $ssl of the current object to true and appends the string "ssl://" to the $relay_host variable. This suggests that the code is configuring a connection to a relay host using SSL (Secure Sockets Layer) protocol. SSL is a commonly used protocol for secure communication over the internet, often used for secure data transfer and online transactions.