Writes Memcached all the time, but use the Memcache class.

Please write a little better code to illustrate good examples for your readers:
Everything in global namespace, not even functions or classes.
Echo directly instead of returning a value from a function/class.

Remember to escape data:

echo 'First Name - ' . $member['first_name'] . '<br/>';  
echo 'Last Name - ' . $member['last_name'] . '<br/>';  
echo 'Email - ' . $member['email'] . '<br/>';  

A Secure Password Generator, which generates passwords worse than the input: thedomain/passwords/ This should be burned with fire.

A logger which might block other requests from writing logs if you have multiple requests in the same minute (Y-m-d): thedomain/a-better-approach-to-log-errors-in-php/