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Is it safe to use either of these lines without having the emails being picked up by email harvesters?
My email: <a href="mailto:<?php echo 'testing@example.com'; ?>"><?php echo 'testing@example.com'; ?></a>
or this one with variables
<?php $email = 'testing@example.com'; ?>
My email: <a href="mailto:<?php echo $email; ?>"><?php echo $email; ?></a>
or does it even matter for as long as it’s generated by PHP then it’s safe?
Those will provide no protection at all. PHP is run on the server side. It will generate an HTML document and send it to the client. From the perspective of a bot or a user this is exactly the same as if you had just put the email address in a normal HTML document: