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U format code (date() function)
UCASE() function
ucwords() function 2nd
ulimit command
    operating systems
         scalability
uncompressing
     source code (Apache installations) 2nd
underline() function 2nd
underscore (_)
underscore characters (_)
     variable names
unitialized variables
Unix
     Apache installation
         configure script 2nd 3rd
         make command 2nd
         source code, downloading
         source code, uncompressing 2nd
     Apache startups 2nd
UNIX
     apachectl tool
Unix
     installing MySQL on 2nd 3rd 4th 5th
     installing PHP on, with Apache 2nd 3rd 4th 5th
     integrating PHP with Apache on 2nd 3rd 4th
    logresolve utility
         hostnames;resolving
UNIX
    OpenSSL library
         installing 2nd
Unix
    rotatelogs programs
         logs (rotating)
    syslog daemon
         errors;logging
         logging errors
    tail command-line utility
         error logs;monitoring
Unix epoch
Unix installation 2nd
     Apache installation 2nd
     MySQL installation 2nd 3rd
     PHP installation 2nd 3rd 4th
UNIX TIMESTAMP() function
unlink() function
     file deletion
unsigned data types
unsubscribe requests 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th 12th 13th 14th 15th 16th 17th 18th 19th 20th 21st 22nd 23rd
unzipper
UPDATE command 2nd 3rd 4th 5th 6th 7th 8th 9th
UPDATE statement 2nd
upgrades
     changelogs
    PHP
         when to upgrade
upgrades (software)
     Apache 2nd 3rd
         modifying without upgrading 2nd
     Apache News and Announcements list
     maintenance releases
     MySQL 2nd
     MySQL Announcements list
     PHP 2nd
     PHP Announcements list
     security issues
     staying current 2nd
     when to upgrade 2nd 3rd 4th
uptime status variable
URLs
    directives
         appplying
USAGE command
user input
     calendar example 2nd 3rd 4th 5th
     creating images from 2nd 3rd 4th 5th 6th 7th 8th
    HTML forms
         accessing from multiple SELECT elements 2nd 3rd 4th 5th
         receiving 2nd 3rd 4th
user login form 2nd 3rd 4th
user management
     database file-based access control authentication 2nd
    functions
         authentication modules
user mangement
     file-based authentication
user sessions
     destroying 2nd 3rd
     functions
    IDs
         passing in query strings 2nd
     session set save handler() function
     starting 2nd 3rd 4th
     storing arrays in
     user preferences 2nd
     variables 2nd 3rd 4th 5th 6th 7th
         multiple, registering
     with registered users 2nd
user table
User-Agent header
user-created functions
user-defined functions
     values, returning 2nd 3rd
usernames
     basic authentication
    storing
         user management;client authentication
users
     adding 2nd 3rd 4th 5th 6th 7th
         database file-based access control authentication 2nd
    deleting
         database file-based access control authentication
    lists
         Require directive
    management
         client authentication
    ownership
         verifying
     redirecting (forms) 2nd
     root
         non root users
         running MySQL as, stopping
    root users
         MySQL running as 2nd
users file
    backend storage
         file-based authentication
utilities
     apxs
    gzip
         Apache source code;uncompressing
    htpasswd
         user password files;managing
    htpasswd.exe
         user password files;managing
    logresolve utility
         hostnames;resolving
    logresolve.exe utility
         hostnames;resolving
    make
         Apache;building 2nd
    rotatelogs utility
         logging program
    tail command-line
         error logs;monitoring (Unix)