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%u format string option (DATE FORMAT() function)
%u formatting directive
UCASE() function
ucwords() function
ulimit command, operating system scalability
uncompressing source code (Apache installs)
underline() function
underscore characters (_), variables
uninitialized variables
Unix
     Apache installs 2nd
         configure script
         make command
         source code, downloading
         source code, uncompressing
     Apache startups
     apachectl tool
     logresolve utility, resolving hostnames
     mod_ssl Apache modules
     MySQL, installing 2nd
     OpenSSL libraries, installing
    PHP
         installing 2nd 3rd
         integrating with Apache on
     rotatelogs programs
     syslog daemon, logging errors
     tail command-line utility, monitoring error logs
UNIX epoch
UNIX TIMESTAMP() function
unlink() function, file deletion
unsigned data types
unsubscribe requests
unsubscribe/subscribe forms, creating (mailing list subscription mechanisms)
unzipper
UPDATE command 2nd
UPDATE statement
upgrades
     changelogs
    software
         Apache
         Apache News and Announcements list
         determining when to upgrade
         maintenance releases
         MySQL
         MySQL Announcements list
         PHP
         PHP Announcements list
         security issues
         staying current
         when to upgrade
uptime status variable
URL (uniform resource locators), applying directives
User-Agent headers
usernames, basic authentication
users
     adding/deleting 2nd
     functions 2nd 3rd
    input
         calendar example
         HTML forms
         images, creating from
     lists, Require directive
     login forms
    managing
         client authentication
         database file-based access control authentication
         file-based authentication
         functions
     ownership, verifying
     redirecting (forms)
     root users 2nd
    sessions
         destroying
         functions
         IDs, passing in query strings
         registered users
         session set save handler() function
         starting
         storing arrays in
         user preferences
         variables
     tables
users file, backend storage
/usr/local/apache2 directory
/usr/local/php/lib directory
/usr/local/src/ directory
/usr/src/ directory
utilities
     apxs
     gzip, uncompressing Apache source code
     htpasswd, managing user password files
     logresolve, resolving hostnames
     make, tail command-line error logs
     monitoring (Unix)